Google Earth

The iPhone's multitouch screen actually makes using the application easier than the desktop versions. Dragging a fingertip across the screen slides the view appropriately, of course. Two-finger pinch gestures not only zoom in and out, but also, by adding a little twirling rotary motion, steer the view's orientation in one direction or another. When the iPhone is tilted a certain angle out of horizontal, Google Earth reads data from the phone's accelerometer and adjusts your view accordingly, so you can look up into the sky. And it's integrated with the iPhone's capability to locate itself through GPS, Wi-Fi networks, and mobile phone towers. There's even a two-finger drag to tilt the perspective back--flight-simulator gamers might think of pulling the stick back to lift the nose of a virtual airplane--and that you also can zoom in and out with single-finger and two-finger double-tapping, respectively. Google Earth lets people virtually fly around a 3D view of the world made from satellite and aerial imagery mapped onto the planet's mountains and valleys. The iPhone version reproduces this core experience, downloading imagery from Google's servers as the perspective shifts and dotting the map with landmarks, photos, and other information. iPhone's multitouch screen actually made using the application easy. Dragging a fingertip across the screen slides the view appropriately, of course. Two-finger pinch gestures not only zoom in and out, but also, by adding a little twirling rotary motion, steer the view's orientation in one direction or another.

You can download this App on iTunes
The App name is Google Earth and it's Free to download.