Virtual Museums - Explore the world's museums, virtually.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
Louvre Museum Online - Explore the entirety of the Louvre's collection for free
Splashify - Beautiful desktop wallpapers for Mac and Windows
Sketchfab for Museums - Browse thousands of cultural artifacts in 3D and VR
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.