Dover Castle has a "Great Tower" (see below) but the name refers to all the buildings enclosed within the castle walls. There are guard posts, churches, military barracks, and several other outbuildings.
The following pictures are all from the inside of the Great Tower. It was all decorated as it would have been during the time of Henry II. The kids had a great time exploring it.
After we toured the Great Tower we took the kids to the shop and let them pick a toy. The boys all picked wooden swords and Miriam picked a crown.
The view from the rooftop of the Great Tower.
The tour talked a lot about Operation Dynamo, which was the effort by the British government to rescue allied forces from the coast of France after they were cornered by the German army. It was a really interesting story and if you're in the mood for a bit of history, look it up. I didn't get any pictures of the tunnels because photography wasn't allowed during the tour.