Watch Lascaux: How To Save 18,000 Years Of History (2017) : Full Movie Online Free Lascaux IV, a hybrid piece of concrete, steel and resin 262 yards long, will be an exact reproduction of the world famous Lascaux cave. Nearly 150 people will take part in this venture. Artists and craftsmen will have just 3 years to bring to life the 18,000 year old work of prehistoric art.