It looks like 3D models.

You can see the models through google maps on the normal web interface. If you go to a city, zoom in so your screen is a few blocks across and select "3D" view from the lower right corner. It should load 3D models of the buildings. Then if you hold Control which clicking and dragging, you should be able to freely rotate your view around the map's center point and see the buildings from any angle.

EDIT: and I should mention, it works all over the place, not just cities, i.e.: https://www.google.ca/maps/@41.0775591,-71.9351097,67a,20y,2...