This 1.20 acre park, located off Ocean Avenue on Marblehead Neck, gets its name from the castle-like private home next to the park. Once known as “Great Head”, Castle Rock was a lookout for arriving and departing fishing fleets and for pirate and enemy ships, both British and France. It offers spectacular views of the Atlantic Ocean with benches, fishing and off-shore sailing. The park can be reached by a pathway from Ocean Avenue. Nearby on-street parking is free but limited to two hours.