Belém Tower (Torre de Belém), located at the mouth of the Tagus River, is not just a defensive structure, but one of the primary architectural symbols of Lisbon and all of Portugal. This elegant 35-meter building was constructed between 1515 and 1521 and is a striking example of the unique Portuguese Manueline style, which blends elements of Gothic, Renaissance, and Moorish motifs. Originally, the tower served as a fort and a point of departure for sailors heading on long voyages during the Age of Discovery.

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Interestingly, the tower was originally built on a small island in the middle of the river, but over time the Tagus riverbed shifted, and today it stands practically on the shore. While there is a theory that the tower was once in the very center of the river, this has not been fully confirmed. Throughout its long history, the structure has served as a gunpowder warehouse, a customs house, and even a prison whose underground cells were regularly flooded. The name "Belém" comes from the Portuguese pronunciation of the word "Bethlehem."
Today, Belém Tower, consisting of four floors and a bastion, attracts travelers from all over the world. In 1910, it was declared a national monument, and since 1983, along with the nearby Jerónimos Monastery, it has been listed as a UNESCO World Heritage Site. This status underscores its immense cultural and historical significance, making the tower a must-see on the itinerary of any visitor to Lisbon.