Big Ben rises at the north end of the Palace of Westminster and has marked time along the Thames since 1859. This 315-foot (96-meter) Gothic Revival tower houses the great bell that strikes every quarter hour, accompanied by four smaller bells playing the Westminster chimes. The four clock faces, each 23 feet (7 meters) across, are visible from far away. Those who want to climb the tower must go up 334 steps and book a tour several months in advance. Westminster Bridge offers a good spot to take in the full view.

The Royal Clock Tower in Mecca rises to 601 meters (1972 feet) and anchors the Abraj Al Bait complex overlooking the Masjid al-Haram mosque. Each of the four clock faces measures 43 meters (141 feet) in diameter and is topped by a 21-meter (69-foot) gilded crescent spire. Completed in 2012, the structure houses a hotel, residential units and prayer spaces. The clock's LED lighting remains visible over 10 kilometers (6 miles) away at night. The tower serves as a landmark for more than two million annual pilgrims and coordinates prayer times for visitors from different time zones.

The Spasskaya Tower rises from the eastern wall of the Moscow Kremlin and has served as the main entrance to this historic complex since 1625. The tower stands about 233 feet (71 meters) tall and carries an astronomical clock on all four sides, originally designed by English clockmaker Christopher Galloway. The mechanism has been renewed several times over the centuries, most recently in 1999. Its bells ring during official state occasions, and the tower brings together Russian and Western European architectural styles from the 17th century. It is clearly visible from Red Square and is one of the most recognizable clock towers in the world.

The Rajabai Clock Tower rises on the campus of the University of Mumbai. Built between 1869 and 1878 to designs by architect George Gilbert Scott, it stands about 279 feet (85 meters) tall. The banker Premchand Roychand paid for its construction and named it after his mother. Its carillon once played melodies several times a day, and ships in the harbor used it as a reference point. The facade carries stone figures drawn from different cultures. Today the tower is part of the Victorian and Art Deco Ensemble of Mumbai, a UNESCO World Heritage property, together with the university library next door.

The Zytglogge is a 13th-century clock tower that originally served as the western gate of Bern's old town fortifications. Its 15th-century astronomical clock displays not only the time but also the day of the week, month, zodiac sign and lunar phases. Every hour, a mechanical figurine show featuring a jester, a crowing rooster and a parade of bears draws the attention of passersby. The tower marks the zero point for all distance measurements in the canton of Bern and stands within the UNESCO World Heritage Site perimeter.

The Giralda has stood in Seville for more than eight centuries, carrying the marks of two very different eras. The tower, about 341 feet (104 meters) tall, started as a minaret for the great mosque during the Almohad period in the 12th century. After the Reconquista, it became the bell tower of the cathedral. In the 16th century, Renaissance levels were built on top. Inside, instead of stairs, a wide ramp runs all the way up, built so that mounted guards could ride to the top. From the viewing platform, you can see across the rooftops of the old city. The Giralda is part of the UNESCO World Heritage Site of Seville Cathedral.

The clock tower of Philadelphia City Hall rises more than 550 feet (168 m) and ranked among the world's tallest inhabited buildings when completed in 1901. The four clock faces measure 26 feet (8 m) in diameter and operate through a mechanical clockwork driven by four one-ton weights. An eight-meter bronze statue of William Penn, founder of the Pennsylvania colony, stands at the tower's summit. The observation deck provides views across downtown and surrounding neighborhoods. The tower marks the geographic center of the original city plan and combines the function of a civic landmark with precise public timekeeping.

The Peace Tower is the central feature of Parliament Hill in Ottawa. Built between 1919 and 1927 as a war memorial, it marks the main entrance to the Centre Block of Canada's Parliament. The tower holds a carillon of 53 bells and the Memorial Chamber, a commemorative space dedicated to fallen Canadians. Four lit clock faces display the time above the city. An observation platform at around 230 feet (70 meters) up offers views over Ottawa and the Ottawa River.

The Ferry Building clock tower rises 245 feet (75 meters) above San Francisco's waterfront and has served as a harbor landmark since 1898. Designed in the Spanish Renaissance style, this tower structure draws from Seville's Giralda and houses a mechanical timepiece that drives four clock faces measuring 14 feet (4.3 meters) in diameter. The building survived the 1906 earthquake and underwent restoration in the early twenty-first century, preserving its original architectural details. The tower marks the eastern terminus of Market Street, connecting downtown to the bay.

This 307-foot (93-meter) clock tower from 1914 designed by John Galen Howard stands at the center of the Berkeley campus. The tower houses a 61-bell carillon that sounds three times daily and has served as a central landmark for more than a century. An observation platform at 200 feet (60 meters) offers views across San Francisco Bay and the surrounding hills. The architecture combines technical precision with classical forms and shows the influence of the Venetian campanile at St. Mark's Square.

The Zimmer Tower in Lier is a medieval tower to which watchmaker Louis Zimmer added an astronomical clock in 1930. Thirteen dials show the time, lunar phases, tides, zodiac signs and other sky phenomena. This tower stands in this collection as an example of mechanical watchmaking brought to life on a historic city tower. Inside, visitors can see how all the dials work together.

The Custom House Tower shapes Boston's financial district skyline, combining neoclassical architecture with the city's maritime trade history. Built between 1837 and 1847 as a federal building, it received its distinctive clock tower in 1915, which remained the city's tallest structure for decades. The four clock faces each measure over 13 feet (4 meters) in diameter and were visible from much of Boston Harbor, allowing incoming vessels to read the time. The tower originally served as a customs house, monitoring shipping traffic and import duties. The granite and stone facade features hand-carved details typical of 19th-century federal buildings, while the added tower section shaped the city skyline.

The Ghanta Ghar, also called Ghari Chowk, stands at the heart of the walled old city of Lahore, where several traditional bazaars meet at a busy crossroads. Built during the British colonial period, the tower combines Victorian architecture with local building traditions. For over a century, it has been a meeting point for traders, residents and visitors passing through this historic quarter.

The clock tower of Waterbury Union Station rises 240 feet (73 meters) above the city and marks one of the most architecturally significant railroad stations in New England. Completed in 1909, the station incorporates elements of Italian Renaissance and classical American architecture. The tower has shaped the Waterbury skyline for more than a century and serves as a landmark for travelers and residents. The station remains connected to the regional rail network and documents Connecticut's railroad history.

The Torre dell'Orologio on St. Mark's Square is one of the oldest working clock towers in this collection, in operation since the late 15th century. Its astronomical dial shows the hours, lunar phases and zodiac signs on a blue enamel face with gilded details. Two bronze figures known as the Moors have struck the hour on the bell above the tower since 1497. The mechanism has been restored several times and still runs in its original form. Guided tours let visitors see the clockwork up close and look out over the square below.

The Jam Gadang stands in the center of Bukittinggi and combines traditional Minangkabau architectural forms with a public timekeeping function. Built in 1926, the structure reaches 85 feet (26 meters) in height and features a distinctive roof shaped like buffalo horns, reflecting local design. Four clock faces display a notable detail: the numeral four appears as IIII instead of the Roman IV. An observation platform provides views of the city and the surrounding hills of West Sumatra. The clock tower was rebuilt after the 1926 earthquake and has since marked the business district on a pedestrian square.

This clock tower rises from the central square of Jaffa and marks the historic entrance to the old city. Built in 1906 under Ottoman administration to celebrate Sultan Abdul Hamid II's silver jubilee, the structure reaches approximately 82 feet (25 meters) and displays four clock faces. The tower has served as a landmark for residents and visitors for more than a century. Its architecture combines Ottoman and European elements typical of the early twentieth century. The tower marks the transition between old Jaffa and the newer neighborhoods of Tel Aviv.

The Sapporo Clock Tower is a white wooden building from 1878 that started as a drill hall for the Sapporo Agricultural College. Its clock movement was made in Boston in 1881 and still chimes every hour. Standing in the middle of a modern city center, the tower feels like a window into a different era. It is one of the few surviving wooden Western-style buildings from the early Meiji period in Hokkaido, and it now works as a museum tracing how Sapporo grew from a farming settlement into a large city.

The Ghanta Ghar stands in the center of Kathmandu, serving as a public timekeeper in the Nepali capital. This clock tower marks a point at the intersection of several main streets, connecting historical urban planning with practical orientation. Like other clock towers in the collection, the Ghanta Ghar reflects the role of these structures as urban reference points that combine architectural presence with timekeeping, helping to shape the rhythm of public life in Kathmandu.

The Peace Watch is a clock tower located at the Hiroshima Peace Memorial Museum. The structure stands in Peace Memorial Park and serves as an architectural element within an urban complex dedicated to commemorating the events of August 6, 1945. The tower combines contemporary design with a practical timekeeping function, fitting into the collection of historic clock towers that merge technical precision with public significance. Visitors to the museum pass the tower as they approach the exhibition spaces.

The Puerta del Reloj is the historic main gateway into the walled old town of Cartagena. Set into the ramparts in the 16th century, it gained its bell tower in the 19th century, when a four-faced clock was added. Three arched passages run through the structure: the central arch was made for carriages, and the two side arches for people on foot. Standing at the Plaza de los Coches, the tower marks the point where the Getsemaní neighborhood meets the UNESCO World Heritage old town. In this collection of clock towers, the Puerta del Reloj stands out as an example of Spanish colonial military architecture put to everyday public use.

The Joseph Chamberlain Memorial Clock Tower, known as Old Joe, rises 330 feet above the University of Birmingham campus and stands as one of the most recognizable timekeeping structures in English academic architecture. Completed in 1908, the red-brick tower honors Joseph Chamberlain, the university's first chancellor, and combines Romanesque forms with local construction materials. The clock face spans more than 23 feet in diameter, while the four bronze bells have marked academic hours for over a century in the Edgbaston district. An observation platform at 165 feet (50 meters) delivers views across the university grounds and Birmingham's rooftops. This clock tower links historical educational purpose with practical timekeeping function and forms the architectural center of one of Britain's major campus complexes.

This Clock Tower stands in the city center and is part of Portugal's public history. It shows how cities once made time visible to everyone. The tower is a fixed point in the urban landscape and easy to explore on foot. Those who climb it often get a wide view over the surrounding rooftops and streets.

The Ghanta Ghar is a prominent clock tower in the center of Jodhpur, marking the entrance to the busy Sardar Market. The structure was built during the reign of Maharaja Sardar Singh in the 1910s, combining local Rajput architecture with colonial influences. The tower rises above the surrounding bazaar and has served as a landmark for residents and visitors for more than a century. Its position at the junction of several trading streets makes it a natural meeting point in the old city, where vendors sell spices, textiles and handicrafts.

Izmir's Clock Tower rises in the heart of Konak Square, a central gathering point in the city center. Standing 25 meters (82 feet) tall, this 1901 structure commemorates the 25th anniversary of Sultan Abdülhamid II's accession to the throne and was designed by French architect Raymond Charles Péré in Ottoman style with Moorish ornamental details. The four fountains at its base were a gift from Kaiser Wilhelm II, while the clock mechanism itself was supplied by the German firm Johann Mannhardt. The tower forms a recognizable ensemble with the nearby Yalı Mosque, framing the square against the backdrop of Izmir's gulf. Its detailed stonework and octagonal design make it an enduring reference point for locals and visitors passing through the busy plaza.

The Dolmabahçe Clock Tower stands next to Dolmabahçe Palace on the Bosphorus. It was built between 1890 and 1895, during the reign of Sultan Abdülhamid II. French architect Sarkis Balyan designed the 27-meter tower, which has four clock faces set on a square base with decorative reliefs. The clock mechanism came from Johann Mayer in France. The tower marks the main entrance to the palace and long served as a public timepiece for the Beşiktaş district. It brings together Ottoman and European architectural elements in a way that reflects the tastes of the late 19th century.

The Torre del Mangia was built between 1338 and 1348 on the Piazza del Campo in Siena, rising to a height of 289 feet (88 meters). The slender brick structure was designed by architect Lippo Memmi and stands beside the Palazzo Pubblico, the city's Gothic town hall. Its name refers to the first bellringer, Giovanni di Duccio, whose nickname Mangiaguadagni (profit eater) reflected his spendthrift habits. The tower's white travertine top houses a bell dating from 1666, historically used to summon council meetings and warn of dangers. Visitors can climb over 400 steps to the viewing platform, which provides panoramic views across the medieval cityscape and the Tuscan countryside.

The Torre dell'Orologio rises at the edge of Piazza delle Erbe in Mantua, marking one of the city's central public squares. The structure dates to the 15th century and displays features of Renaissance architecture in northern Italy. The clockwork mechanism has been modified over time to meet mechanical standards of different periods. Visible from the square, the tower serves both as a timekeeper and as a landmark within the historic city center. The structure fits into the urban development of Mantua shaped under the rule of the Gonzaga family. Its position on Piazza delle Erbe, a traditional marketplace, underscores the role the tower has played in the public life of the city across centuries.

The Reloj Monumental de Tecozautla stands at the center of this town in Hidalgo state and belongs to a Latin American tradition of clock towers that shape public squares. The tower shows the time for everyone crossing the main plaza and serves as a meeting point for residents and visitors alike. It stands in a region known for its hot springs and gives daily life in the town a fixed reference point.

This clock tower rises above a converted industrial building in Mott Haven in the Bronx, dating from the borough's manufacturing heyday. The tower marks the historic factory complex and reflects the commercial past of the neighborhood, which now features a mix of repurposed industrial structures and residential properties. The structure illustrates the typical combination of practical timekeeping and architectural orientation found in American factory buildings from the late nineteenth and early twentieth centuries. The tower remains a reference point in the Mott Haven streetscape and documents the industrial development of the Bronx.

The Ghanta Ghar is a clock tower dating from British colonial rule in the center of Multan. The structure marks a major junction in the city and combines European architectural elements with South Asian urban history. The tower serves as a landmark in the busy streets of the old city and documents urban planning developments during the colonial administration of the 19th and early 20th centuries in the Punjab region.

The Birgunj Ghanta Ghar is the central clock tower of this Nepali border city. It stands in the heart of Birgunj's commercial district, where merchants, commuters and residents have passed by it since it was built. The clock face is visible from several streets, and the tower marks a spot where trade routes and public transport come together.

The Victoria Clock Tower stands in the center of Christchurch and represents the Gothic Revival architecture that shaped Victorian New Zealand. The structure functions as an urban landmark, connecting historical design with its role as a public timekeeper. This tower belongs to a global collection of clock towers that combine technical precision with varied architectural styles from different periods.

This clock tower at the Old Post Office stands on Pennsylvania Avenue in Washington, D.C., combining function with civic architecture. Built in the late 19th century, the structure originally served as the city's main post office and now houses a museum documenting the history of mail delivery and the building's role in the capital's public life. The tower offers views across the downtown area and represents the American clock tower tradition of that era, merging practical timekeeping with monumental design.

The Torre de los Ingleses stands over the Retiro district of Buenos Aires and is one of the city's most recognizable clock towers. Built in 1916 from English Portland stone and red brick, it shows five clock faces driven by a Westminster-pattern mechanism. After the Falklands War in 1982, the Argentine government renamed it Torre Monumental, but locals still use the original name in everyday conversation.

The 150-foot (45-meter) Tour de l'Horloge stands on Quai Alexandra in Montréal's Vieux-Port, combining architecture with practical timekeeping. The tower structure was completed in 1922 and serves as a memorial to Canadian sailors who died in World War I. The Beaux-Arts building displays four clock faces near its summit and marks the entrance to the historic port area. Visitors can climb an interior staircase to the observation deck, which offers views across the St. Lawrence River and the city skyline. The Tour de l'Horloge links maritime history with urban landmark.

This clock tower was erected in 1933 and stands in the center of Acaxochitlán, forming a recognizable element of the town's civic identity. The structure combines functional timekeeping with local architectural expression and has shaped the townscape of this Mexican municipality in Hidalgo state for nearly a century. The tower serves as a public landmark and documents the technical and design approaches of early twentieth-century provincial administrative centers in Mexico.

The Prague Astronomical Clock sits on the south wall of the Old Town Hall and has been running since 1410, making it one of the oldest working clocks of its kind in the world. The upper dial tracks the positions of the sun and moon through the zodiac. The lower dial shows the months with their zodiac signs. Every hour from 9 a.m. to 11 p.m., twelve mechanical apostles move past two small windows above the main dial. The clock displays four different ways of measuring time, including Babylonian and sidereal time. It was badly damaged in World War II but later restored.