An app to accompany your visit to Treak Cliff Cavern in Castleton in the Peak District. It includes audio commentary that will assist you on your self-guided tour of the cave system. Treak Cliff Cavern is famous throughout the world for its unique and large deposits of Blue John stone and houses some of the most beautiful cave formations found in the UK. The app also uses Location Services and Bluetooth Low Energy to determine your location when the app is running in the background. It will tri