Hivemapper - Build maps that reveal changes 🌏
Virtual Museums - Explore the world's museums, virtually.
Urban Jungle Street View - Explore the world through Google Street View: Jungle Mode
Louvre Museum Online - Explore the entirety of the Louvre's collection for free
Cat Street View - Explore Japan... as a cat.
Sketchfab for Museums - Browse thousands of cultural artifacts in 3D and VR