Dover Castle, Dover, Kent
The Norman keep dates from around 1155 and is built of ragstone, ashlar blocks and flint, with Caen stone decoration. Around the keep are blocks of 18th century houses. Surrounding these blocks are 2 rings of walls and towers dating from Mediaeval times. Beneath the castle there are a whole series of underground passages dating from the 13th century. They were improved for defence during the Napoleonic Wars. This property is now in the care of English Heritage (2010).
