57.3900°N, 18.3200°E.
Mästermyr Labyrinth, Gotland is a prehistoric or medieval stone-formation labyrinth in Gotland Island, Sweden. The design is a classical 7circuit layout with 7 circuits, 8 walls, built of stone. Construction date is recorded as unknown in the surveyed catalogue. Current condition: intact. A stone labyrinth in the Mästermyr area of southern Gotland, near the site where the famous Mästermyr chest was discovered in 1936 — a Viking-era toolbox containing over 200 tools representing the complete kit of a traveling smith/carpenter, dating to circa 1000 CE. Documentation sources: 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.