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The Citadel, Horseguards Parade, The Mall, was built 1940-41 as an operations centre for the Admiralty. The foundations are nine metres deep, and a six metre thick concrete roof protects the main rooms. In the event of a ground attack the building would be defended from a number of loopholed firing positions. In an attempt to disguise the original function of the building, it is now covered with Russian vine. It is still used by the Ministry of Defence, and is now part of the Whitehall communications centre. TQ299802
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