The Niteroi Contemporary Art Museum (Museu de Arte Contemporânea de Niteroi — MAC) is situated in the city of Niteroi, Rio de Janeiro, Brazil, and is one of the city main landmarks. It was completed in 1996.
Designed by Oscar Niemeyer with the assistance of structural engineer Bruno Contarini, who had worked with Niemeyer on earlier projects, the MAC-Niteroi is 16 meters high; its cupola has a diameter of 50 metres with three floors. The museum projects itself over Boa Viagem (Bon Voyage, Good Journey), the 817 square metres (8,790 sq ft) reflecting pool that surrounds the cylindrical base like a flower, in the words of Niemeyer.
A wide access slope leads to a Hall of Expositions, which has a capacity for sixty people. Two doors lead to the viewing gallery, through which can be seen the Guanabara Bay, Rio de Janeiro, and Sugarloaf Mountain. The saucer-shaped modernist structure, which has been likened to a UFO, is set on a cliffside, at the bottom of which is a beach.