Nottingham Castle, a castle in Nottingham, England, is located in a commanding position on a natural promontory known as "Castle Rock", with cliffs 130 feet (40 m) 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. The Duke of Newcastle later built a mansion on the site, which was burnt down by rioters in 1831 and left as a ruin. It was later rebuilt to house an art gallery and museum, which remain in use. Little of the original castle survives, but sufficient portions remain to give an impression of the layout of the site.