The Baja Great Murals are found throughout the mountains and arroyos of the Baja California peninsula of Mexico, focussed in the Sierra de San Francisco a UNESCO World Heritage site, they are part of the American Rock Art Archive. Studied by Harry W. Crosby who followed the King’s Highway, El Camino Real and the trail of the Jesuit Missions, with research into the Cochimi culture, the painted caves are featured in the documentary film Baja California - In Search of Painted Caves. The archive includes the rock art of the Serpent Cave and a Baja Great Murals style guide.
Have a look at this terrific archive about Cave Paintings in Baja California, Mexico