Hello,
there is a wonderful 3d OSM model of Moscow (Kremlin) :
f4 is (unfortunately closed source) 3d viewer for OSM data.
What about the White House?
The specification behind:
http://wiki.openstreetmap.org/wiki/Simple_3D_Buildings
Smart JOSM PlugIn for 3D modeling:
http://wiki.openstreetmap.org/wiki/Kendzi3d
Best,
Marek