The Chełm Chalk Tunnels are a network of underground tunnels located in the town of Chełm, Poland. These tunnels were created in the 19th century during the extraction of chalk, a soft white limestone used in various industries. The tunnels stretch for over 40 kilometers and are known for their unique chalk formations and historical significance. Today, the Chełm Chalk Tunnels serve as a popular tourist attraction, showcasing the region's geological history. Visitors can explore parts of the tunnels, which feature interesting sculptures and artifacts, while learning about the area's mining heritage and the role of chalk in local industry.