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Belém Tower is a fortified tower located in the Belém district of Lisbon, Portugal. It is a UNESCO World Heritage Site (along with the nearby Jerónimos Monastery) because of the significant role it played in the Portuguese maritime exploits of the era of the Age of Discovery. The tower was built in the early 16th century and is composed of a bastion and the 30 m (98 ft) tall tower. It is dedicated to the patron saint of Lisbon, St Vincent, and commemorates the expedition of Vasco de Gama.