Built in 1555, the impressive Fortaleza de Santa Cruz was the first fort on Guanabara Bay. The cannons are distributed over two levels, but more impressive are the 17th-century sun clock and Santa Barbara Chapel. The views over Rio de Janeiro span out in all directions, so keep your camera on hand. It takes 15 minutes by taxi to reach the fort from downtown Niterói, and costs about R$35. The on-site restaurant serves good coffee and light meals.
Estrada General Eurico Gaspar Dutra , Niterói, 24370–375, Brazil