We were at Dover Castle on March 22, which was a great time to avoid crowds. The Secret Wartime Tunnels onsite are definitely worth seeing.
The keep has a decent (but not extraordinary) display related to Henry VIII, and there is a nice audio-visual presentation on the Siege of 1216. The interior of the keep has the austere stone feel one might expect of a medieval castle. There is an impressive model of a trebuchet on the grounds.
Combine this with the Roman lighthouse onsite (reputedly the tallest remaining Roman structure in England), and you have one attraction that covers an impressive range of historical importance, from Roman times through WWII.
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