Peak Cavern was formally known as the 'Devils Arse' before being called Peak Cavern. It is in the centre of the village, right underneath Peveril Castle. It has the largest natural cave entrance in Britain and the second largest in the world. The stream that drains from Peak Cavern through the village is claimed by local legend to result from Satan urinating inside the cavern ! The underground river (fondly called the river styx) formed the cave, and as the cave grew, the first part of the cave ceiling collapsed. A small gorge was formed which leads to today's cave entrance. This is seen here with a cottage (possibly a former water mill or miners cottage) beside it.