Ballinger Crater, Arizona, U.S.A. (Date of photograph unknown)
Aerial view of Meteor Crater, Arizona. Sometimes called the Barringer Crater, it was recognised as a meteor impact crater early in the 20th century and is thought to be about 25,000 years old. Several attempts to mine the iron-rich material of the meteor were made before a visitor centre was built in the 1960's. The crater is in northeastern Arizona, near Winslow, and is about 200 metres (600 feet) deep and 800 metres (1/2 mile) across.