Unique Petroglyphs Found On Colorado Rocks

Unique petroglyphs have recently been found on boulders in Colorado. The exact location is not specified, however, the markings bear a resemblance to drawings left behind by the Inca Empire although ancient Indian tribes could also be responsible.

These petroglyphs are not exclusive to Colorado. Others have been found recently in southern Utah and many parts of the western US often in very obscure locations.

Have you ever encountered drawings like this when hiking in the mountains? If so, care to share any pics? Or, do you believe this is the work of vandals?