This is similar in a way the post from a while back (This is Now! and it is VERY cool if you like Instagram!) on looking at random Instagram pictures from specific cities. This service takes it a step further and allows you to not only see Instagrams from a city, but also from a landmark or even building within that city! Take a look at Worldcam and enjoy!
Worldcam is built on Foursquare, Instagram, Geonames and Geoplugin’s APIs, lets you search for Instagram photos of a specific location in any city in the world. The entire service could also be described as an easy way to look inside any building, since Instagram users often take photos indoors.