This is Cartagr.am, by best web design companies rankings.
It shows popular public photos from Instagram arranged on a map.
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Click and drag to pan around ... Scroll with your mouse or + and - to zoom ... Search for a place name like New York, Paris or London or zoom to your current location.
Labels fade in if you move the mouse, and fade out if you don't. This needs some fine-tuning :)
We're hard at work on better integration with Instagram, a clearer set of labels, and an iPad app. Otherwise...