Photo: Jaredzimmerman (WMF), CC BY-SA 4.0 Free museums & galleries in San Francisco
Photo: Jaredzimmerman (WMF), CC BY-SA 4.0 
Photo: User:Piotrus, CC BY-SA 3.0 Musée Mécanique
Free, always
Photo: Beyond My Ken, CC BY-SA 4.0 SFMOMA free galleries
Free outside, paid inside
Photo: Fine Arts Museums of San Francisco (FAMSF), Public domain de Young Hamon Tower
Free, always
Photo: Sanfranman59, CC BY-SA 3.0 San Francisco Maritime Visitor Center
Free, always
Photo: Fine Arts Museums of San Francisco (FAMSF), Public domain