Rainbow Bridge in Arizona was initially thought to be the world’s highest naturally-made bridge, topping 290 feet. However, later discoveries of other natural stone bridges - such as Shipton’s Arch in China towers at 1,200 feet - squashed that notion. Rainbow Bridge continues to play a key role in several Native American tribes’ cultures, three of which are the Ancient Pueblo people, Paiute, and Navajo. Due to its cultural significance, President William Howard Taft declared the stone bridge a National Monument in 1910.