Along with Brimstone Hill in St. Kitts, Shirley Heights in Antigua, and Ft. Charlotte in St. Vincent, the Cabrits National Park's Ft. Shirley ruins are among the most significant historic sites in the Caribbean. Just north of the town of Portsmouth, this 1,300-acre park includes a marine park and herbaceous swamps, which are home to several species of rare birds and plants. At the heart of the park is the Ft. Shirley military complex. Built by the British between 1770 and 1815, it once comprised 50 major structures, including storehouses that were also quarters for 700 men. With the help of the Royal Navy (which sends sailors ashore to work on the site each time a ship is in port) and local volunteers, historian Dr. Lennox Honychurch restored the fort and its surroundings, incorporating a small museum that highlights the natural and historic aspects of the park and an open canteen-style restaurant.