This picturesque canyon formed by the Yellowstone River is home to two of the park's most beautiful waterfalls, the Upper Falls (109 ft/33 m high) and the Lower Falls (308 ft/94 m high). You can view the canyon from several lookout points on either side, but you'll appreciate it most if you hike the trails along the canyon edge. The view from Artist's Point, accessible by a paved path, is picture-perfect: The yellow, orange, red and brown canyon walls frame the Lower Falls for a stunning vista. If you're feeling energetic, hike down into the canyon on the asphalt trail. There are benches along the way to rest and admire the view. You can often spot osprey, which nest near water. Near Canyon Village, off the Grand Loop, Yellowstone National Park. http://mms.nps.gov/yell/features/canyontour/index.htm.