A vast underground bunker with its own railway station and hospital lies deep underground in rural Corsham, Wiltshire. The Cold War-era network of tunnels and secret rooms was constructed in the late 1950s amid fears of a nuclear attack.
Codenamed Burlington, it was intended to home around 4,000 people including government officials, scientists and members of the Royal Family. The prime minister at the time - Harold Macmillan - would have taken shelter there where he'd have run whatever was left of the country in the event of a nuclear strike, The Mirror reports.
The underground city never needed to be used for what it was built for but was maintained until 1991 when its upkeep became too costly. The existence of the bunker remained top secret, though, until 2004 when it was officially declassified.
