December 20, 2016 This London Christmas bar is a cavern with an underground lagoon (!?) December 20, 2016/ J.T. Ellison There are many reasons why I, Amy, want to go to London.But I think I found a new attraction atop my To-Do list.Get a load of this: there's a new Christmas bar that just opened. That's a cavern. With an underground lagoon.What!?!?