The Belem Tower (Torre de Belém) in Lisbon is famous as a global symbol of the Age of Discovery and is recognized as a UNESCO World Heritage site. Built between 1514 and 1520 on the banks of the Tagus River, it originally served as a fortified gateway and defense system for the city. It is the most iconic example of the Manueline style of architecture, which features ornate stonework inspired by nautical themes, such as twisted ropes, armillary spheres, and exotic animals—including the famous "rhinoceros gargoyle." For centuries, it was the last sight Portuguese explorers like Vasco da Gama saw before embarking on their voyages to India and the Americas, and the first landmark they sighted upon their return. Beyond its military history, the tower has served varied roles as a lighthouse, a customs office, and even a notorious political prison. Today, its striking location jutting into the river and its intricate, cream-colored limestone facades make it one of Portugal’s most photographed monuments, representing the era when the nation led the world in maritime exploration and global trade.