Did you know that Chartres cathedral has a labyrinth inside? Pilgrims in the middle age used to cross it while praying. But it’s true meaning was never discovered or understood. This is why today there is many speculations going around it because of the lack of surviving documents of the construction and original use of the Chartres labyrinth.
Chartres Cathedral is a working building and a place of worship. Normally, the nave of the cathedral is lined with chairs and most of the labyrinth is subsequently obscured. It has long been the tradition at the cathedral to remove the chairs and uncover the labyrinth, to allow it to be walked. In recent years the cathedral authorities have also instigated a program of regularly uncovering the labyrinth every Friday during the summer months.
Nobody actually knows when the labyrinth was constructed, because no surviving documents record that information. In its center, all that remains of the brass or copper plaque that formerly decorated the centre of the labyrinth in Chartres Cathedral are the worn stubs of the rivets that held it in place. The plaque was removed in 1792, supposedly to be melted down for cannons for the army of the newly founded French Republic.
Most of the speculations are related to design of the maze. You can find countless opinions on the web about it(about the number of stones, its design, its size and so on).