Nottingham Castle is a castle in Nottingham, England. It is located in a commanding position on a natural promontory known as "Castle Rock", with cliffs 130 feet high to the south and west. In the Middle Ages it was a major royal fortress and occasional royal residence. In decline by the 16th century, it was largely demolished in 1649. Beneath Nottingham Castle, there is a labyrinth of man-made sandstone caves and tunnels; all of them are related to countless secrets of Nottingham, an old town that stands on the soft, sandstone rock. Nottingham Castle’s subterranean caves and tunnels have hundreds of years of dramatic history hidden within their walls.