building=yes is a searchable and linkable index of every single way tagged building=yes in OpenStreetMap (OSM).

A web page for every building in OpenStreetMap!

You can link to buildings using their 64-bit building=yes identifier or their OSM way ID.

Each building has been tagged with one or more Where On Earth (WOE) IDs so you can also search for buildings by place.

Where every single way means every single way as of late-January 2011.

⇦ What's that over there to the left? Why that's Untitled Building #2170790601 and others near it. It's in Éguilles, Provence-Alpes-Cote d'Azur, Bouches-du-Rhone, France.