Elevation Earth is a universal iOS app (US$2.99) that displays a 3D model of our planet. You can manipulate your location with finger movements on the screen while rotating and zooming into Earth using standard iOS gestures.
The app shows more than 300 annotated locations, like where the Titanic sank, impressive mountain peaks and famous cities. Of course, you examine any place on earth. Elevation is sometimes subtle on a 3D map of the planet, so the app lets you exaggerate elevation up to a hundred times.
One of the most striking effects is to manipulate sea level and watch areas flood and drain in a very compelling animation. Looking at the deepest parts of the oceans, you can begin to understand the difficulty in locating the missing Malaysian passenger jet.