Point zero in Paris is located in the middle of Notre Dame Square, fifty metres from the entrance to the Cathedral of the same name on Ile de la Cité.
It can be clearly seen on the ground of the Square. It is in the shape of a compass rose with a bronze block set in stone in its centre.
From this point, one calculates all distances to Paris, imagining that one always starts or arrives from here.
However, in the past, it had a different meaning.