53.7019°N, 6.4894°W.
Knowth Passage Tomb is a labyrinth installation in County Meath, Bru na Boinne, Ireland. The approximately 67 metres in diameter with built of stone. Documented age: ~3200 BC (3200 BC). Current condition: restored. Containing the greatest collection of megalithic art in Western Europe — over 300 decorated stones surpassing even its famous neighbor Newgrange — Knowth's passage tomb complex dates to approximately 3200 BCE, making it older than the Egyptian pyramids. Documentation sources: Eogan 1986. 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.