MAC is a Rio icon—even if, in fact, it’s in the city of Niterói, on the opposite side of Guanabara Bay. To get there, catch the ferry from Praça XV, downtown, and then take a bus when you reach the other side. As you approach, the museum’s silhouette looks like a sort of flying saucer in the middle of the bay. In this remarkable building, designed by genius architect Oscar Niemeyer, you’ll find a collection of contemporary art. Your visit to Niterói includes the extraordinary view of the Rio skyline, across the shimmering liquid mirror of Guanabara Bay.