Photo: Donatas Dabravolskas, CC BY-SA 4.0 Free museums & galleries in Rio de Janeiro
Photo: Donatas Dabravolskas, CC BY-SA 4.0 
Photo: Arne Müseler, CC BY-SA 3.0 de Museum of Tomorrow
Free at certain times
Photo: Photograph by Mike Peel (www.mikepeel.net)., CC BY-SA 4.0