About 5 miles northeast of Stromness, the Ring of Brodgar is a magnificent circle of 36 Neolithic standing stones (originally 60) surrounded by a henge, or deep ditch. When the fog descends over the stones—a frequent occurrence—their looming shapes seem to come alive. The site dates to between 2500 and 2000 BC. Though the original use of the circle is uncertain, it's not hard to imagine strange rituals taking place here in the misty past. The stones stand between Loch of Harray and Loch of Stenness.