About 50,000 years ago, mammoths and (my favorite) giant ground sloths were wondering around peacefully through the woodlands in the middle of what is now known as Arizona when, from the very sky itself came a nickel-iron asteroid, 50 meters (162 feet) around came crashing through the trees and blew a 4,000 ft diameter hole in the ground. Poor sloths, I imagine they never even knew they were hit.
Oddly enough, the crater is privately owned and not even named a national monument.
PS. Nasa has a great site called "Astronomy Picture of the Day" that has amazing photos. Even one of the http://apod.nasa.gov/apod/ap971117.html!
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