Considering the Balladins Carcassonne in Carcassonne?
A VT member wrote the following comment about visiting Carcassonne:
Place du Grand Puits by leics
This is the oldest well in La Cite (there are 22 altogether), but it would be very easy to miss (I almost did). It may well date from the Roman occupation of the site and, according to legend, the Visigoths hid their treasure from Solomon's temple in it. Strangely, the water has often been said to be unfit for human consumption!