Copacabana Fort was built in 1914 as part of Rio's first line of defense, and many original features, such as the thick brick fortification and old Krupp cannons, are still visible. In the '60s and '70s, during Brazil's military dictatorship, political prisoners were kept here. The fort is impressive in itself, and the entrance archway perfectly frames a postcard view of Sugar Loaf. The on-site military-history museum is worth a stop, as is the café (excellent coffee,
pastries, and desserts), which has sweeping beach vistas.