HORSESHOE CANYON PHOTO GALLERY. The GREAT GALLERY in Horseshoe Canyon (Canyonlands National Park) is widely considered the finest Pictograph site in the Americas. 3 additional sites in the Canyon included here are ALCOVE, HIGH GALLERY, HORSE SHOE SHELTER . For more information on the Rock Art in the Canyon, click HERE. Click on the first thumbnail to see larger image. Use controls at bottom of each large image to start slide show or go through manually with arrow keys.