Oldest known chess pieces in existence, carved from walrus tusk and whale teeth. 93 pieces were found in a stone chamber in a sand bank on the west coast of the Isle of Lewis in 1831 in the Western Isles off the coast of Scotland. They date back to 1150-1170. The pieces form parts of 5 sets, two complete. The pieces were discovered by a peasant who found a mysterious stone building buried under several feet of sand. It is believed the pieces were crafted in Norway. The pieces reside in the British Museum and the National Museum in Edinburgh.