flyOver is a new function of the Maps application that allows owners of iPhone 4S terminals and iPad 2/3 tablets to see 3D models of cities, and here we are not talking about drawings but about real images of the buildings in the respective cities. The function is only available on 3 devices at the moment, but you don't have to worry too much because you don't lose anything because Apple didn't manage to photograph enough cities for now. Lower you have lists all the cities where you can use FlyOver and notice that many important capitals are not in it.
Chicago
Copenhagen
Los Angeles
Miami
Montreal
Sacramento
San Francisco
Seattle
Sydney