Yellowstone National Park's Grand Canyon of the Yellowstone.

This rugged, colorful canyon was carved by the powerful Yellowstone River over thousands of years. The Grand Canyon of the Yellowstone's most famous attractions are its two very impressive waterfalls—the Upper Falls and the Lower Falls. The Lower Falls is twice the height of Niagara Falls, with a drop of about 300 feet (90 meters), while the Upper Falls drops 109 feet (33 meters). The area also features several hot springs and steam vents. For those who want to stay in the area, Canyon Village offers accommodations, including hotel rooms, RVs, and tent campsites.