I'm always on the lookout for airfields as photo subjects when I fly, and on a trip to Phoenix last year spotted one in southern Utah which looked, ah, "adventurous", a mesa-top strip with a very definite "you will be airborne at this point" layout,
Turns out this is actually for very good design reasons, because it's not actually an airport. It's a rocket-sled test track used to evaluate ejection seats and other escape capsules, which were triggered at the end of the track and then (hopefully) floated down into the valley 1,500 ft. below. There is a small unpaved runway just off to one side as well. The full story of the track is at: http://www.airfields-freeman.com/UT/Airfields_UT_SW.htm.