Last year archaeologists in France discovered an underground complex of tunnels and rooms cut into the rock beneath the village of Sublaines, in the district of Bléré-Val-de-Che.
The network of tunnels and rooms extends for more than 50 meters (160 feet). Notice the niches for lamps in the picture at the top; there were also benches, planks on the floor, and a well for water.
The complex has been dated to the 11th century by pottery found in the fill, including this pot. (Which I really love. I have a thing for coarse earthenware, and this is a magnificent specimen.)
The tunnel entrance was concealed under a small post building. In the late 11th century this region was disputed between the Counts of Blois and Anjou, so there was a great deal of fighting. The archaeologists' theory is that these tunnels were built as a refuge and a place to hide valuables, perhaps by a family of well-off peasants or minor gentry.