A late 18th century grotto which is a long curved red brick barrel vaulted tunnel with a side chamber, which would originally perhaps have been lined with wood and stone to form a natural looking cavern. There are still wooden fixings for such a lining in the stonework. The entrances are clad in randomly coursed limestone rubble and the semicircular entrance arches are contrived to appear quite natural. For the full description and the legal address of this listed building please refer to the appropriate List of Buildings of Special Architectural or Historic Interest. {1}