View on top of the concrete structures at Fort Fremont Historical Park in Saint Helena Island, SC on Sunday, February 22, 2015. Copyright 2015 Jason Barnette  Fort Fremont consists of several concrete artillery batteries built 1898 in response to the Spanish-American War. The fort was intended to defend local Naval Station Port Royal from invading ships during the war. The fort was deactivated in 1921. Over the next eight decades the property switched hands between several private owners until 2004 when the Trust for Public Land and Beaufort County Council bought the property.   Today the property is open to the public to explore the ruins of the concrete batteries. The area is only lightly maintained, and visitors enter at their own risk. However, it is a rare and thrilling place to explore.