The keystone is the most important component of an arch. However, it is also the component that endures no stress — and, typically, responsibility and stress go hand in hand. A keystone is the ...

Double Arch, at 112 feet, is the tallest arch in the park. At 144 feet in length, it's also the second-longest arch in the park. Luckily, this natural wonder is easy to reach. The half-mile trail ...