For official web pages of some important cave sites, check out the following:
- Altamira at http://www.culturaydeporte.gob.es/mnaltamira/home.html
- Chauvet at http://www.culture.gouv.fr/culture/arcnat/chauvet/en/
- Lascaux at http://www.lascaux.culture.fr/?lng=en
The Bradshaw Foundation website is worth visiting, if you have not already, for images of Upper Paleolithic artwork and tools: http://www.bradshawfoundation.com/origins/index.php
There are many other websites featuring artworks of the Upper Paleolithic.
- Cantabria University: https://grupos.unican.es/arte/Ingles/prehist/paleo/b/Default.htm
- Paleolithic Art and Culture: http://www.visual-arts-cork.com/prehistoric/paleolithic-art-culture.htm
- Smarthistory: https://smarthistory.org/paleolithic-art-an-introduction/
- ThoughtCo: https://www.thoughtco.com/what-is-paleolithic-art-182389
The documentary Cave of Forgotten Dreams, by IFC Films, features astounding images from within Chauvet Cave at http://www.ifcfilms.com/films/cave-of-forgotten-dreams.
While not as ubiquitous online, some websites also feature artworks of the Middle Stone Age.
- Encyclopedia of Stone Age Art: http://www.visual-arts-cork.com/prehistoric/blombos-cave-art.htm
- Smithsonian Institution’s National Museum of Natural History: http://humanorigins.si.edu/evidence/behavior/art-music
ThoughtCo.com: https://www.thoughtco.com/blombos-cave-167250