When most people think of Arizona, they imagine miles and miles of dry rock, sand, and mountains — and the occasional saguaro. Though we can't deny parts of our state fit that description, those who know better also are aware of places like Tonto Natural Bridge State Park, home of Tonto Natural Bridge Falls. This impressive waterfall spills over the side of the Tonto Natural Bridge, which is known to be the world's largest natural travertine bridge. Visitors can see the 183-foot waterfall from observation decks at the top of the canyon or take the easy 300-foot hike to the bottom to get a dose of perspective and realize the scale of this natural wonder.