Heading in the chalk mine of Chelm.
Dug into the chalk under the city is a multi level and quite extensive cave system, created by the mining of chalk in middle age. These have served as protection for the population in times of war and can still be visited. The full extent of the caves is unknown, once many of the towns people had there own entrance to the system under there house, useful both for shelter and to carry out their own mining business.
