We are very lucky to have Dover Castle literally 5 minutes away from our home. We are also members of the English Heritage so after paying the initial membership, it means we can visit as many times as we like and it doesn't cost us a penny. It is one of those places that we just love exploring.
Our go to place whenever we take a trip up there is to the Medieval tunnels, the girls love sitting on the cannons whilst Daddy Hazelden tries to scare them as we walk further into the dark.