Some of our earliest texts were written on cave walls. We can only guess at their meaning and purpose, but we can and do admire the beauty and sophistication of these renderings. Spend a few unforgettable minutes on some of these sites. You won’t regret having taken the time to view them.

Upper Paleolithic (Late Stone Age 50,000-10,000 years old)
Drawings and polychrome rock paintings of wild mammals and human hands.

The Chauvet-Pont-d’Arc Cave (Ardèche, France). The dating had been a matter of some dispute, but a study published in 2012 confirmed the dates of 30,000 and 32,000 years ago. Handprints and child footprint.
http://www.bradshawfoundation.com/chauvet/chauvet_cave_art.php

The hit of the 2010 Toronto International Film Festival was 3D documentary about the Chauvet cave, by Werner Herzog. Entitled The Cave of Forgotten Dreams, it’s 90 minutes long, but is fascinating enough to be “leisure” watching if you can spare the time… http://www.youtube.com/watch?v=4Y0guHHDN5Q

Pech-Merle Cave (Lot, near Cahors, France). 25,000 and 16,000 BC. Still open to the public (1926-). http://www.pechmerle.com/english/introduction.html

Lascaux (Dordogne, France). 20,000 years old. Discovered in 1940, closed in 1963. The cave contains nearly 2,000 figures: animals, human figures and abstract signs.
http://www.bradshawfoundation.com/lascaux/

Niaux (Ariège, France): at least 14,00 years old. Visited as early as 1602 (graffiti)
http://www.grands-sites-ariege.fr/fr/grotte-de-niaux/detail/1/presentation-1#!prettyPhoto

Altamira (Spain) (14,000 years old). Discovered in 1880, and denounced as a hoax. Authenticated in 1902. http://whc.unesco.org/en/list/310

There are many YouTube entries available as well.