A closer look
Forget the Grand Canyon's slow, billion-year geological drama; this hole in the ground was violently punched into Earth by a 50-meter asteroid in a matter of seconds. Spanning nearly a mile across, the Barringer Crater is so perfectly preserved that NASA used its jagged, alien-like terrain to train the Apollo astronauts for moonwalks. It is the ultimate roadside attraction for anyone harboring a healthy fear of deep-space projectiles.






