Chartres Labyrinth
The stone floor of Chartres Cathedral still bears its ancient floor labyrinth (1205), used for walking contemplation by monks and still used for meditation by pilgrims. There is just one path through the labyrinth and it is 964 feet long. The circumference of the labyrinth is 131 feet, almost exactly the same size as the West Rose window. And the labyrinth is the same distance from the west entrance as the West Rose is from the floor - so if the west wall fell inwards, the rose would land directly on the Labyrinth.