Long a cultural backwater, Rio de Janeiro has taken another leap toward becoming an art hot spot with this month’s opening of a museum built around one of the world’s premier collections of contemporary Latin American art. Casa Daros, a 129,000-square-foot space in an impeccably renovated 1866 mansion, will house some of the works acquired over the past 13 years by Ruth Schmidheiny, a Zurich-based collector, working with German curator Hans-Michael Herzog. Casa Daros is but the latest of a host of new museums springing up in Rio. This month also saw the inauguration of the Rio Art Museum, which is dedicated to art celebrating Rio’s picture-postcard cityscapes. Two other big museums, one dedicated to science and the other to sounds and images, are scheduled to open in the coming years.