Museu de Arte Contemporânea - Niterói
Rio de Janeiro
From the New York Times:
Get up early and take a 20-minute ferry ride across Guanabara Bay to the Niterói Museum of Contemporary Art, also known as the MAC (Mirante de Boa Viagem; 55-21-2620-2400; www.macniteroi.com.br; 4 reais), designed by the Brazilian architect Oscar Niemeyer. It resembles a flying saucer, and offers excellent views of the bay and Rio. Barcas S/A runs the ferries every 30 minutes on weekends, leaving from the downtown Praça XV de Novembro (55-21-4004-3113; 2.10 reais).