57.6800°N, 18.7500°E.
Nisseviken Trojaborg 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 9 metres in diameter, built of stone. Documented age: Modern (holiday cottage area) (Modern (holiday cottage area)). Current condition: intact. A 12-wall double-angle classical labyrinth on the shoreline near summer cottages at Nisseviken, demonstrating the enduring connection between Baltic labyrinths and coastal sites. Documentation sources: Gotland Trojaborgs PDF. The same seven-circuit topology appears at this site as at every other classical labyrinth on Earth. 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.