The Google Cultural Institute provides access to thousands of works of art and museum exhibits through an interactive, highly engaging portal. The aim is to make cultural heritage from around the world freely accessible to all. You will find artworks, landmarks and world heritage sites, as well as digital exhibitions that tell the stories behind the archives of cultural institutions across the globe.
This video will give you a glimpse of what is available but (warning!) you will need to visit the site and be prepared to lose a few hours to start to see the magnitude of what is available.
The Google Cultural Institute is highly relevant to teachers of history, geography and of course art.