Gotland is the largest island in the Baltic Sea. It holds four hundred Bronze Age cairns, seventy Iron Age forts and several stone ships. Trojeborg, the largest of Scandanavia's stone mazes and said to be a passageway to the Underworld, was believed to have been used in ritual magic, with sailors navigating it as protection against death on a coming voyage.
Once home of the Goths, legend had it that Gotland was originally ruled by an evil spirit who sank the island by day and made it rise by night until Tjelvar drove it away with fire.
Gotland was a center of trade in ancient times and was one of the proposed locations of Atlantis.