The area around Moab, Utah, is famous for its natural arches, and many are preserved in Arches National Park. Quite properly, of course, those arches are shielded from human activity, and some of them would certainly be at risk of damage if the crowds were allowed to swarm over them. Still, it would be fun to actually walk across a natural stone arch, and Gemini Bridges let you do just that. This pair of robust arches are perfectly safe, and legal, to cross on foot. They stand on public land operated…