Stairs on one side, an elevator on the other and a museum dedicated to the bridge. The two towers are linked by the decks and they both have glass floors. It's a pretty cool sight to do in London.

The tower on the left is home to the Tea Wizard who uses parts of the lower floors for the nation's biscuit reserves. The one on the right is host to a princess that's been waiting for rescue by a prince for a very long time now.

https://www.towerbridge.org.uk/whats-inside

For a long time, I thought the crown Jewels were there. But it turns out the Tower of London and London Tower bridge are two different things!

Gnomes

Here's a video that shows some of the tower internals:

https://www.youtube.com/watch?v=iitXhgif_lo

Just safeguards against it falling down, falling down, falling down I think.

The bridge was designed to allow using the elevated sidewalk when the drawbridge is up. It does not go up often anymore.

I only know this because there's a mission in Watch Dogs Legion that's inside it.

The actual royal family that was usurped by the current one we see

Tower Bridge has its own website which has a little information about what’s inside (though it’s mostly trying to get you to do a tour).

Steak and ale pies on the left and gravy in the right.

beans

I went to a party in the top bit once. It’s just a sort of empty corridor that you can hire. Amazing views down the river.

so

1. stairs
2. hallways

?

It's where they keep all the cheese. Jeez, everyone in the UK knows that. Try to keep up Nigel. FFS

Read the wikipedia article first.