If you’re like me, you have trouble putting the heights of objects and land features in perspective–tall buildings are 1000 feet or more, tall mountains are 20,000 feet or more (though they rarely have a prominence of half that height), and airplanes fly at 30,000 feet. All of these features are nicely synthesized in the info-graphic below, thanks to ouramazingplanet.com. I especially appreciate all the under-water features that have been included. The creators of this image have another new info-graphic that deals with even larger distances here.
Similarly, also see:
http://xkcd.com/482/
http://xkcd.com/485/