Belém Tower is a UNESCO World Heritage Site that stands as an iconic symbol of the Age of Discovery.
The Spasskaya Tower, also known as the Savior Tower, is the main tower on the eastern wall of the Moscow Kremlin which overlooks the Red Square.
The Powder Tower is a Gothic tower in Prague, Czech Republic and one of the original city gates.
The Zytglogge is a landmark medieval clock tower in Bern, Switzerland.
The Guinigi Tower in Lucca, Italy is a historical monument famous for its hanging garden on the rooftop.
Neuenburg Castle, located in Freyburg, is a striking piece of historical architecture.
Kärnan is a preserved medieval tower in Helsingborg, Sweden.
The Torre de la Plata is an octagonal military watchtower located in Seville.