The Great Gallery in Horseshoe Canyon is one of the most significant rock art sites in North America. It is in a remote area of Canyonlands National Park, Utah. A trip there requires plenty of preparation, plus the equipment and willingness to drive a 30-mile gravel road to the trailhead. Once there, you’ll need to hike down through the slick rock, which contains a few high drop-offs into the canyon. It is a moderately strenuous hike of about 6.5 miles roundtrip with an elevation loss/gain of about 800 feet at the beginning and that much to climb back up at hike’s end.