13. There's A Secret Bar At The British Film Institute
Plenty of visitors to the much-loved British Film Institute (BFI) in Southbank, just under Waterloo Bridge, know the Benugo Bar. It's a cosy place to grab a meal or a drink during intermission. But, amazingly, the bookshelf in the bar contains a secret door! When this door is opened, visitors find a long, dark corridor that leads to The Drawing Room, a hidden bar that serves cocktails and nibbles to those who know how to find it.