57.6525°N, 18.3072°E.
Visby Trojaborg (Galberget) is a prehistoric or medieval stone-formation labyrinth in Gotland Island, Sweden. The design is a classical 11circuit layout with 11 circuits, 12 walls, approximately 18 metres in diameter, built of stone. Documented age: Possibly 2500 years (500 BC) (500 BC - Medieval). Current condition: intact. Sweden's most famous stone labyrinth sits below Galgberget ('Gallows Hill') north of the medieval Hanseatic city of Visby on Gotland. Documentation sources: Saward 2003, Kraft 1983, Gotland Trojaborgs PDF. A figure that resolves into a single unbroken line when traced from edge to centre and back. The labyrinth is one of several hundred sites of this type catalogued globally; each preserves the same unicursal walking-pattern with regional variation in scale, material, and date.
The labyrinth tradition spans at least 4,000 years of documented practice across northern Europe, the Mediterranean, the British Isles, North America, and the Indian subcontinent.