I was recently teaching a concentration and jhana retreat in France. After the retreat I visited some nearby caves that contained prehistoric paintings and engravings from Cro Magnon Era. Pondering what the lives, thoughts, and experiences of these people might have been like tens of thousands of years ago stretches my imagination and conventional references of time. No one knows why these ancient people crawled deep into these caves and created these stunning images.
You can have a virtual visit to one of these caves through this interactive video: http://www.lascaux.culture.fr/?lng=en#/en/00.xml