Earlier this month, the Google Cultural Institute unveiled its Street Art Project, a veritable trove of paste-ups, murals and stencil work. The website allows you to navigate an interactive map of the world, and click on cities to discover over 5,000 different works — from Tunisia to the Philippines (incidentally, one of the best represented countries on the site). But it's more than just a straightforward Google Maps mashup — it also features in-depth exhibits on works that are no longer around, like the iconic 5Pointz factory in Long Island City, Queens, that was whitewashed last year after providing a canvas to thousands of artists for over a decade. Or Tour Paris 13, a nine-storey apartment building whose walls were filled with street art in the months before its demolition. The site also pulls in user contributions on Google+ marked with hashtags like #StreetArtist and #StreetArtProject. In the gallery above, we've collected some of our favourite pieces.
And if that isn't enough street art for you, NYPL Labs (the New York Public Library's tech team) has been playing around with the Google Street View archive, and has devised an open-source tool that allows you to go back in time to see how a given wall has changed year after year. Check out this interactive page, which allows you to compare different images of New York's Bowery Wall.