A busy seaport, Dover, England, is best known for its chalky white cliffs. The town itself is rather drab, but a steep climb takes you to its 900-year-old Norman castle, which overlooks the English Channel. The castle has double walls and underground tunnels (a nerve center for many World War II operations) to explore. The city's museum is worth a visit as well.
If you're in good shape, you may want to take in the views from the trails of the Western Heights.
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