Fort Flagler Historical State Park, Military heritage park on Marrowstone Island, United States

Fort Flagler Historical State Park occupies the site of a former U.S. Army coast artillery fort at the northern tip of Marrowstone Island, on a 10-meter bluff above Admiralty Inlet and Port Townsend Bay. The park covers 1,451 acres and has 5,800 meters of shoreline. Its concrete batteries include a circular pit with stepped ledges and an upper deck with a metal railing, portholes, and graffiti.

This fort was established in 1897 and formed a defensive triangle with Fort Worden and Fort Casey to control the entrance to Puget Sound. The three positions worked together to guard Admiralty Inlet against naval attack.

Battery Wansboro was rearmed in 1960 with two 7.6 cm guns brought from Fort Wint in the Philippines, and these are the guns visitors see in place today. The small museum covers the fort's military history, and several former gun positions can be entered. Many area cultural and athletic groups hold their annual conferences and meetings in the park.

The park is easy to explore on trails leading to the batteries and historic buildings, with information signs at key spots. You can stay overnight in the former military buildings or simply walk through the grounds to enjoy the coastal views.

Battery Wansboro was rearmed in 1960 with two 7.6 cm guns brought from Fort Wint in the Philippines, a display arrangement rather than a combat role. The fort entered the National Register of Historic Places in 1976. The Marrowstone Point Light, built from 1888, still operates at the island's northeast tip and cannot be visited.