Rainbow Bridge National Monument consists of a 160-acre block of land surrounded almost entirely by the Navajo Indian Reservation. Its prime attraction is Rainbow Bridge, the largest, the most symmetrical, and arguably the most beautiful natural bridge in the world. Rising 290 feet above the streambed of Bridge Creek, the bridge is 32 feet thick at its narrowest and spans 270 feet. It consists entirely of salmon-pink Navajo sandstone.
Located on the northwest flank of 10,000-foot-high Navajo Mountain, Rainbow Bridge lies on the floor of a deep sandstone canyon, whose sheer cliffs rise as much as 1,000 feet. The setting was so spectacular that Zane Grey wrote a novel entitled Rainbow Bridge, in which the natural bridge takes on a mystical aspect. Former president Theodore Roosevelt, on a visit in 1913, wrote that he awakened several times in the moonlit night to gaze silently at the looming arch.