The Meteor Crater is a meteorite impact crater in the northern Arizona desert. It is the result of an asteroid chunk's collision with the earth 50,000 years ago. It is the largest impact crater yet discovered in the country. Click on link to find out how it was named.
Since you are talking craters I will link my favorite one (again) . In Arizona. It's #1 on my bucket list, providing it ever gets completed. http://rodencrater.com/about