“I found myself alone, standing at the entrance to a yawning limestone cavern, dazzled by dawning sunlight.”

“They emerged into a large natural cavern that had been modified by adding cells and alcoves around the wall.”

“It's like you're finally emerging from the deep, dark cavern of your own mind.”

“It is a fairytale world of weirdly shaped hills, as well as spectacular caverns of stalagmites and stalactites in endless shapes and forms.”

“We can't wait to go back and see one of the other four caverns, Blue John Cavern but we need to give the legs a rest first!”

“Karst is an area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams, and caverns.”