Lincoln Castle, Lincoln, Lincolnshire, UK

Lincoln castle remains one of the most impressive Norman castles in the United Kingdom. It is still possible to walk around the immense 12th century walls with its ramparts providing a magnificent view of the castle complex, together with panoramic views of the cathedral, the city, and the surrounding countryside. Oriel window Another attraction is the opportunity to see one of the four surviving originals of the Magna Carta, sealed by King John after his meeting with the Barons at Runnymede in 1215, a document which is now housed within Lincoln castle. There is also an accompanying exhibition, explaining the origin of the Magna Carta and its far reaching effects. Parts of the prison are also open as a museum, including the 19th century chapel, which is the only original chapel designed for the 'Separate System' (every seat is enclosed) left in the world today. The women's wing of the prison opened to visitors in 2005.