El Zanjón de Granados, Archaeological site and tourist attraction in San Telmo, Argentina.
El Zanjón de Granados is an underground complex beneath a restored mansion from the 1830s in San Telmo, Buenos Aires. The site features a network of brick tunnels, water tanks, and archways that connect different levels of the excavated space.
The complex was discovered during the 1980s renovation of the mansion on the property. The structures date back to the colonial era and reveal how Buenos Aires managed water systems in its early development.
The site reveals how residents managed water and adapted to urban life over centuries in Buenos Aires. Walking through the tunnels, you see the layers of how people organized their daily lives across different eras.
The site is accessible only through guided tours, as it is a protected archaeological excavation. Tours are offered in multiple languages and reservations are recommended in advance.
The excavation revealed an original stream called Tercero del Sur that once flowed from Plaza Constitución towards the river through the neighborhood. This underground watercourse was a vital part of Buenos Aires' water system before the city expanded and built over it.
Location: Buenos Aires
Website: https://elzanjon.com.ar
GPS coordinates: -34.61669,-58.37180
Latest update: December 6, 2025 19:08
Buenos Aires reveals a patrimonial wealth that goes beyond the usual circuits. This collection gathers places that tell the story of the Argentine capital through its architecture, green spaces, and cultural institutions. From the XVIIIth-century tunnel network of El Zanjón de Granados to the 22 stories of Palacio Barolo, these sites reflect the city's urban evolution. The itinerary includes diverse sites such as Palermo's Japanese Garden with its ponds and pavilions, the Museo de Arte Español Enrique Larreta showcasing works from the Middle Ages to the 20th century, and the moving Floralis Genérica sculpture whose petals open at sunrise. Neighborhoods like San Telmo, Barracas, and Colegiales offer architectural discoveries such as 19th-century passages, facades decorated with mosaics on Calle Lanín, and the Mercado de las Pulgas filled with Argentine antiques. These locations allow exploring Buenos Aires beyond postcards and observe how the city has preserved its history while growing. Each site provides a different perspective on porteña culture, from Carlos Gardel’s tango to European and Asian influences shaping the city’s identity.
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