49.9130°N, 6.3030°W.
Giant's Castle Labyrinth, St Mary's is a prehistoric or medieval stone-formation labyrinth in Isles of Scilly, England. The design is a classical 7circuit layout with 7 circuits, 8 walls, built of stone. Documented age: Modern (20th century). Current condition: intact. A modern stone labyrinth near the airport on St Mary's, the largest of the Isles of Scilly, named after the nearby Iron Age fortification known as Giant's Castle. 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.