Across the deserts of the American southwest are one of the largest concentrations of geoglyphs outside of Peru’s Nazca Lines. These ancient Native American works of earthen art can be up to hundreds of feet long, and yet are often invisible until viewed from above. Before drones, GPS, or GoogleMaps, photographer Harry Casey began a unique archaeology project. Armed with nothing more than topographic maps, 35mm film cameras, and his beloved Piper J3 Cub aircraft, Casey spent thirty-five years documenting the region’s geoglyphs before natural erosion and human intervention could destroy these fragile sites. Here, for the first time, is a visual record of these beautiful and mysterious, little-known features.