I am looking for the name of a pub in London that I went to a couple of years ago with my brother... From what I remember, you kind of enter below street level, and it has all these trees in it, like you're in a forest or something. (This is not a very good description - it is a really cool place!) My brother can't remember the name of it, either, but he said it is near Picadilly Circus (just north of Trafalgar square and west of Leicester Square). Sound familiar to anyone?

Thanks!!

Could you possibly be thinking about the Rainforest Cafe? There's one on Shaftesbury Avenue at
Piccadilly Circus.
Rainforest is a chain of tropically themed restaurants, but they do have a bar section.

Or maybe Waxy O'Connor's?

http://www.waxyoconnors.co.uk/london/index.asp

First thing that came to my mind was Waxy's as well.

Fantastic! It is Waxy O'Connors! Thank you so much!!!

You're welcome - have one for us.

Thanks for that link LAwoman. Me and my buddies will definitely be going to O'Conners for a pint or 6.