London is so vast I end up spending hours travelling on trains. They are by far the best way to travel around on and are always full of weird and wonderful characters.
The tunnels are a Crane.tv favourite. We have used the space as a backdrop for several films including a music session with The Civil Wars. The tunnels have a great story behind them and feature one of the only legal graffiti walls in London on their Leake Street side which was championed by Banksy back in 2008.
It is an independent arts organisation in Elephant and Castle. It is one of the best venue for electronic music in London. On Tuesdays Boiler Room, best DJs for free with guest list.