Spectacularly situated above the White Cliffs of Dover, this magnificent castle has guarded our shores from invasion for 20 centuries . Now you can enjoy a great family day out with a visit to the Key to England. Immerse yourself in our dramatic new visitor experience, Operation Dynamo: Rescue from Dunkirk. Explore the darkly atmospheric Secret Wartime Tunnels. Enjoy a colourful contrast with the richly-furnished Great Tower, where costumed actors introduce medieval life at King Henry IIs court.