It was a great pleasure to visit Meteor Crater in Arizona on 14 September 2012. In real life the crater appeared smaller than you would imagine. We were fortunate, however, to see a military Black Hawk helicopter fly into the crater for a spot of sight seeing / low level practice. The Black Hawk helicopter is 64 ft 10 in or 19.76 m in length and this really gave us a sense of scale.
Please see my powerpoint presentation below (you can also download - 63 mb):