One such discovery was unearthed from the Mesa Verde region, where spiral rock carvings were found ... According to LiveScience, the panels of ancient rock art on canyon walls, called petroglyphs ...

Spiral Jetty is one of the world’s most famous works of land art: art that’s created directly ... and arranged 6,000 tons of local black basalt rock into a 1,500-foot-long, protruding line ...