This stunning canyon is 23 mi long, but there is only one trail from rim to base. As a result, a majority of Park visitors clog the north and south rims to see Upper and Lower Falls. Unless you're up for the six-hour strenuous hike called Seven Mile Hole, you have no choice but to join the crowds on the rims to see this natural wonder. The red-and-ochre canyon walls are topped with emerald-green forest. It's a feast of color. Also look for osprey, which nest in the canyon's spires and precarious trees.
Yellowstone National Park, Wyoming, United States