This is your occasional reminder that until 1993 the existence of Post Office Tower in London was an official state secret
Despite it being 177 metres tall, in central London, and having both a revolving restaurant and a gift shop
@troubleMoney
What's the source for it being classified?
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@glowingskull in addition to it being used for standard civilian stuff it was also part of "Backbone", a military communications network designed to withstand nuclear attacks
