The underground city of Naours, located in northern France, is a fascinating historical site consisting of underground tunnels and chambers. It was originally a network of limestone quarries that were later expanded and used as a refuge during times of conflict, particularly in the Middle Ages. This underground shelter, known locally as “many”, was used by the inhabitants of the area to protect themselves from invaders and war conflicts, such as the Norman invasions and religious wars. By the 17th century, thanks to the rampant destruction of the Thirty Years’ War, the underground city had a large and fairly well-settled contingent of residents. The underground city of Naours consists of over 300 rooms, which were used for various purposes such as living quarters, chapels, stables, and storage areas