Grand Canyon of the Yellowstone is ranked #1 out of 17 things to do in Yellowstone National Park. See pictures and our review of Grand Canyon of the Yellowstone.

Stretching from the Lower Falls to the Tower Falls area, the Grand Canyon of the Yellowstone is about 28 kilometers (17 miles) long, 250–350 meters (820–1,150 feet) deep, and 450–1,200 ...