Dover Castle, Kent - one of the best castles I have visited and so much history.....used through WWII for many different purposes......there are 4 miles of underground tunnels that were used as a hospital during WWII.....built on the White Cliffs of Dover
The Grand Shaft, Dover, England UK - Built between 1806-09 the Grand Shaft is a unique triple staircase at Dover to assist troops. It was used by British troops as a shortcut from the top of the white cliffs of Dover at Dover Castle to the town defences below. The shaft is 140 feet deep and 26 feet in diameter. The three staircases built of Purbeck Limestone wind clockwise one above the other.