Tonto Natural Bridge, perhaps the world's largest natural travertine bridge, was formed by mineral-laden spring water deposits over countless thousands of years. The bridge is 183 feet high, and forms a tunnel 400 feet long and 150 feet wide. To get an appreciation for the scale of this massive passage, look for the tiny figures of the people scrambling on the rocks in the center of this photo.
Tonto Natural Bridge State Park is located north of Payson, Arizona. For more info visit the Tonto Natural Bridge State Park web site.
Location: Tonto Natural Bridge State Park, Arizona
Date: July 8, 2007
Time: 12:16 p.m. MST
Camera: Kodak Z650 Zoom Digital