The Shell Grotto - (Welsh: Groto Cregyn) - (sometimes called the Shell Hermitage) is a Grade II* listed (as of 7 February, 1962) late-18th-century stone built, slate roofed shell grotto decorated with shells and animal bones on the interior. It stands on a prominent ridge 700 ft (213 m) above sea level, within the boundary of Pontypool Park, Torfaen in South Wales. It is considered to be the best surviving grotto in Wales. It is an important local landmark commanding views south towards the Severn Estuary. A little further along the same ridge can be found the Folly Tower.