The Colorado Desert contains the only known desert intaglios in North America. Exhibited works included etchings and engravings, woodcuts, cellocuts, lithographs, collage intaglios, and serigraphs. Te capitals, intaglios, and other sculptures are well made. The most famous desert intaglios are the Nazca Lines in Peru. Malcolm J. Rogers subsequently studied and sketched the Blythe Intaglios in 1939. By 1893 all the intaglios except the one at Fort Atkinson had been destroyed. These intaglios are mostly located along the Colorado River. The intaglios are best viewed from the air. The technique uses cameos and intaglios to create a lifelike image. The intaglios are located on flat terraces in the Colorado River floodplain. Other intaglios depict mountain lions, birds, snakes, and unidentified zoomorphic and geometric shapes. Though described as being "engraved", the intaglios are cut by drills, sometimes quite deeply.