Looming large over Praça Mauá, the MAR is an icon for the rebirth of Rio's once derelict port. The huge museum hosts wide-ranging exhibitions that focus on Rio in all its complexity – its people, landscapes, beauty, challenges and conflicts. Start off by taking the elevator to the top (6th) floor, and absorbing the view over the bay. There's also an excellent restaurant here. Then work your way down through the galleries, taking in a mix of international and only-in-Rio exhibitions.