Le Mystère des Faluns - Site troglodytique  Opening on the 10th of february 2024. Falun, ocal shelly sand, was deposited by the sea about 10 million years ago and then hollowed out by man during the 18th and 19th centuries. The site is a real treasure of the patrimony. This site consists of underground galleries 15 to 20 meters high. It’s an unguided visit of 1 hour and last admission 1 hour before closing time. The temperature in the galleries is cool, so bring something warm to put on. Tickets are available from 10th february to 11 of november 2024. No exchange, no refund. Proof required for student fare.