City of Caves in Nottingham, England consists of a network of caves carved out of sandstone that have been used over the years as housing for the poor, a tannery, public house cellars, and as an air raid shelter.
Nottingham Castle is a magnificent century ducal mansion built on the site of the original Medieval Castle. The Castle has a turbulent past, linked to kings and conquerors and still has a maze of original caves hidden beneath its imposing walls.