`Extraterrestrial` Petroglyphs. Many believe that these ancient rock paintings represent alien life forms. Sego Canyon in Eastern Utah.

Petroglyphs at McConkie Ranch near Vernal, Utah.

Native American Indian Fremont Petroglyphs Capital Reef National Park

Petroglyphs at Valley of Fire - Nevada

Petroglyphs

Native American Petroglyphs

Lower Calf Creek Pictographs

Sinagua Rock Art

Ancient rock carvings

Rock Carvings

Indian petroglyphs, Newspaper Rock State Historic Monument, Utah, USA

Petroglyphs

Horseshoe Canyon Great Gallery

Ancient Indian Petroglyph in Moab, Utah

Prehistoric cave painting in Bhimbetka -India.

Rock Drawings in Valcamonica - panorama

Aboriginal rock paintings

Petroglyphs

Ubirr Mabuyo rock art

Pictograph

Grunge bricks wall

Bushmen rock painting

Rock paintings of Tassili N'Ajjer, Algeria

Prehistoric cave paintings over 4000 years Khao Chan Ngam, Nakhon Ratchasima.

Petroglyphs in Colombia