Went on a field trip led by David Casey to Crow Canyon in Northern New Mexico, USA to see the Rock Art. http://www.blm.gov/nm/st/en/prog/recreation/farmington/crow_canyon.html
When I got within 5 feet to the petroglyphs I would get nauseous. When I put my hand on this circle I felt it pulling me in as if it was a vortex. The men on horses are Spanish explorers.
None of these photos are mine.