Skara Brae might trump all of Orkney's other Neolithic sites (which are grouped under one UNESCO World Heritage Site). Here you have a settlement that offers hints of how people lived five millennia ago. Stone hallways connect now roofless apartments complete with beds, dressers and everyday artifacts—all made of stone. It was marvelously preserved because until a storm in 1850 washed away the layer of sand that had long covered it, no one knew it existed. Whether the 50 or so people who lived at Skara Brae were responsible for the Maeshowe burial chamber or the nearby standing stones remains a mystery.