Rainbow Bridge is the largest natural bridge in the world the bridge is 94 metres wide and spans a canyon 85 metres wide. It is located in the red rock desert in Utah in the U.S.A. the top of the bridge is almost a perfect quarter of a circle the underside of the bridge is as smooth and curved as the handle of a cup.

Until 1963 it was only possible to access Rainbow Bridge was by a rough overland trail 20 kilometres long. But then the Glen Canyon dam was built raising the level of the Colorado River and filling the 91 canyons that flow into it you can now travel by boat to within a few feet of the bridge.

The Navajo people who lived in the area believe that the bridge is a rainbow turned to stone, in their belief rainbows are the guardians of the universe therefore they treat the bridge as a sacred place.