Northeast of Plaza de Armas stands the Castillo de la Real Fuerza, Havana's oldest fortress built in 1558. The tower is surmounted by Havana's emblem, la Giraldilla, a weathervane in the form of a female figure, by sculptor Jerónimo Martínez Pínzon (1632). Inside the castle, a museum explains the history of the fortress, and the discovery and exploitation of the New World. Fine view over Old Havana and the fortresses across the water from the top of the tower.