On the banks of the Tagus River is Tower of Belém. It was constructed around 1514 and is also known as the Tower of Saint Vincent, the patron of the city of Lisbon, which commemorated the expedition of Vasco da Gama and also served to defend the port of Lisbon. The structure was built from lioz limestone and is composed of a bastion and a 98.4 ft four-story tower.
A bartizan is an overhanging, wall-mounted turret projecting from the walls of late medieval and early-modern fortifications from the early 14th century up to the 18th century.
Looking out one of the oillets (arrow slits) towards another bartizan.
The cross of the Knights of Christ is repeated on the parapets of this fortress, while the watch towers that flank it are capped with ribbed cupolas inspired by Islamic architecture.
During a restoration and revitalization project in 1845–46, the niche with an image of the Virgin and Child was added.
Breach loading guns, “berços" in Portuguese, in the Gothic rib vaulted casemate. A casemate is a fortified gun emplacement or armored structure from which guns are fired. Originally, the term referred to a vaulted chamber in a fortress.