This sounds interesting. I’d like to visit these London secret tunnels which helped inspire James Bond. These tunnels are where the city braced for the Blitz and also were where secret messages were sent between Washington and Moscow during the Cold War.
The intelligence museum and an interactive World War II memorial would be interesting. The underground bar sounds fun.
https://apnews.com/article/london-secret-tunnels-wwii-007-tourism-9b358cad065fa125e5d66d9ba05c7a7a