Rock art at the Great Gallery of Horseshoe Canyon, Canyonlands National Park, Utah, USA

© Austin Cronnelly/Tandem Stills + Motion

Rock art at the Great Gallery of Horseshoe Canyon, Canyonlands National Park, Utah, USA

You don’t need a museum ticket to visit the Great Gallery at Canyonlands National Park, but you’ll want to bring your hiking boots. This remote archaeological site in Utah is home to one of the most well-known rock art collections in the United States. Archaeologists believe that the pictographs here in Horseshoe Canyon (formerly known as Barrier Canyon) were produced sometime between 400 and 1100 CE, when nomadic hunter-gatherers roamed the desert. Pictured here is the Ghost Panel, named for about 20 life-sized figures that seem to hover above viewers.