Dover Castle is owned by English Heritage and is a very popular tourist attraction. The tunnels have been refurbished as of 2011, and house an impressive D-Day exhibition.
One of the Barrack Casemates
The Redan / Spur Caponnier
Stairs leading between Medieval Tunnels and Spur Tunnels beyond
Guardroom of the Redan
Passage between the casemates
Entrances to Annex Level (left) and Casemate Level (right)