Corona Arch
Corona Arch, also known as Little Rainbow Bridge because of its similarity to that one, is a short hike off the Potash Road, and is really spectacular. It is one of the larger arches in the country, and one of the only two that I know of that has had an airplane fly through it. Photos of that are visible in several restaurants in Moab: the plane was at a 90-degree angle to its usual attitude as it banked through the arch.