For tens of thousands of years, these Palaeolithic artworks were unseen. When they were rediscovered, onlookers marvelled at their vivid beauty. One of the world’s leading experts took me up close For tens of thousands of years, these Palaeolithic artworks were unseen. When they were rediscovered, onlookers marvelled at their vivid beauty. One of the world’s leading experts took me up close T he aurochs, the mammoth and the steppe bison are long extinct, but their painted likenesses still look