Rainbow Bridge, USA

Rainbow Bridge in southern Utah state is the world’s largest natural bridge. Although well known to local native tribes, the spectacular sandstone structure was not investigated by American researchers until the early years of the 20th century. This was partly due to the isolation of the structure, a fact remedied by the creation of Lake Powell and its tributary waterways.

Incorporated into Rainbow Bridge National Monument in 1910, Rainbow Bridge stands 88 m (290 ft) tall, has an 84 meter (275 ft) span and is 13 meters (42 ft) thick at its top point.

Source: webecoist.com