Miles of white sand beach, Back River Lighthouse Ruins A gravel road leads you on a half mile tour of tidal marshlands and then to miles of white sand beach.There is over 2 miles of beach. Follow the beach until you reach the lighthouse ruins. The Back River Lighthouse was built in 1829 for $4250. It stood for 127 years before being completely destroyed by a hurricane in 1956. All that remains is a pile of rocks about 50 yards in the ocean.