Explore 13 forbidden places in London you’re not allowed to visit, from secret tunnels, abandoned Underground stations, restricted government buildings, hidden bunkers, sealed military sites, private islands, off-limits rooftops, forgotten prisons, inaccessible palaces, underground rivers, abandoned hospitals, mysterious locations, London secrets, forbidden places in the UK and restricted sites most people will never see. This journey reveals the most hidden, historic and inaccessible corners of London, where secrecy, danger, power and strict access rules keep these places completely out of reach.