60.1080°N, 18.8180°E.
Grisslehamn Labyrinth is a prehistoric or medieval stone-formation labyrinth in Uppland, Sweden. The design is a classical 11circuit layout with 11 circuits, 12 walls, built of stone. Documented age: 15th-16th century (15th-16th century). Current condition: intact. A stone labyrinth at Grisslehamn on the Uppland coast — the traditional ferry crossing point to the Åland Islands, used since the 17th century as a postal route between Sweden and Finland. Documentation sources: Kraft 1983. A pattern with one entrance, one path, and no choices — repeated by unrelated cultures across thousands of years. 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.