Côa Valley Archaeological Park, Portugal - Encompasses an important array of rock-shelters with prehistoric paintings. Illustrated description of the site, its rock art and the Paleolithic period, with visitor information.

Petroglyph: Exploring Yorkshire's Prehistoric Rock Carvings - Graeme C. presents location maps, photographs and descriptions of the Neolithic and Bronze Age rock carvings of Great Britain - of the cup and ring type.

Graffiti Prevention at Rock-Art Sites - Article discussing causes and prevention of destruction.

Rock Art and Petroglyphs in Valcamonica - Footsteps of Man Archaeological Society is investigating prehistoric petrogyphs in the Alps. Clickable map leads to images. Descriptions of sites and periods.

Bradshaw Foundation - A Web site that advocates the study of petroglyphs and other forms of prehistoric art. Site features a directory of links and image galleries of rock art.

Hawaiian Petroglyphs - A gallery of historic and prehistoric rock art from two locations on the island of Lanai.