The Rainbow Bridge is a bridge that has been preserved because it was located on the old route 66. Since then, the route has been moved and it is now on a country road, but you can still go and see the bridge while traveling in Kansas on Route 66. The Rainbow Bridge, found 2 miles west of Riverton, crosses Bush Creek. It is actually the only marsh arch bridge along the route, so it is definitely a sight to check out, especially since it has been around since the 20s. There are no special tours you can take, but it is not a difficult place to find on your own. The ride there alone is worth the drive!