Found on the Kent coastline, these artillery castles were originally built by King Henry VIII. Walmer has been converted into the Lord Warden's stately-home and Deal is now a museum with a permanent exhibition.
Being Britain's closest point to Europe, the city has been built to defend against invasions. The fortress dates back to the 11th century and there are WW2 war tunnels with a tour providing a vicarious experience.
Cabins and boats line the shores of a peaceful remote river with refreshingly cool waters. The nearby fort is a short kayak trip away and there is also a unique waterfall where hot spring water meets a cold river.