Chislehurst Caves are a series of man-made tunnels located in Chislehurst, Kent, England. These caves were originally created for the extraction of chalk, which was used in the production of lime and cement. Over the years, they have expanded to form a complex network of passageways that stretch for over 22 miles. The caves have a rich history, having been used for various purposes, including as a shelter during World War II. Today, they are a popular tourist attraction, offering guided tours that showcase their fascinating geology and historical significance, as well as their unique underground environment.