http://worldwind.arc.nasa.gov/ Nasa basically modelled and textured the entire world, using satalites and other photos. For the most part i think things are where 1 pixel represents a meter on the ground. You can zoom in and pick out anyplace you want to see. I found my old house, as well as saw Disney World, the White House, and the city where I was born.
One of the coolest things using technology yet. Using something like this, you could do some really cool stuff.