"Outer space is not far at all;
It's only one hour away by car if your car could go straight up!"
Sir Fred Hoyle, Astronomer
How high is space? How deep is the ocean? This site allows you to visualize such distances on the surface of the planet. It also calculates the time to travel to these places (if you could drive straight up/down or over oceans).
The circles below show the extents of different levels of the earth's atmosphere. Click on a circle to learn more. Make sure to use the zoom on the upper left to see all the layers. Then, by selecting a different system from the box in the upper right, explore what other distances look like on the face of the earth, including the distance to the deepest part of the ocean (surprisingly small) and the radius of Jupiter (unsurprisingly big).
The starting location is the Franklin Institute (a Philadelphia center of science). To gain an idea of scale, the map also shows current locations of SEPTA trains (they move as GPS coordinates updated).