Ye Olde Trip to Jerusalem in Nottingham, is probably England's oldest inn. This Public house is built into the rocks that Nottingham Castle now stands on.
The pub is famous for its caves, carved out of the soft sandstone rock against which the building stands. The larger ground level caverns are now used as the pub's rear drinking rooms.
There is also a network of caves beneath the building, originally used as a brewery.
They seem to date from around the time of the construction of the castle (1068 AD).
The caves are extensive and can lead you a long way underground, far into Nottingham City Centre.
There is also a route up into Nottingham Castle, although I think this may have been blocked off some years ago.
I remember in my youth we used to play a game at the pub that involved a metal ring on a rope and a horn that was attached to the opposite wall. I think it's called ringing the Bull. I have heard that this game is still played. Why don't you get yourself down to the Trip and have a go. Let me know how you get on.