Dover Western Heights
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First given earthworks in 1779, the high ground west of Dover, England now called Dover Western Heights, was properly fortified in 1804 when Lieutenant-Colonel William Twiss built the Citadel at the western end, North Centre Bastion to the north, and Drop Redoubt overlooking the town. The unique triple spiral staircase, the Grand Shaft linked barracks on the hill to the town below. At the far west are the Outer workings and what is locally known as the 'Citadel Barracks'. Next to the barracks is a Victorian gun battery called Citadel Battery; and behind this lie the remains of the mine field control.
Much of the site is open as a country park. The barracks have been demolished; the Grand Shaft is only open occasionally; and the Citadel has been a Young Offenders' Institution - and is now an Immigration Removal Centre and so is off limits.