The Pelham Islands is a historical name for a group of islands in western Long Island Sound that once belonged to Thomas Pell. The main islands in the group are City Island, Hart Island, Hunters Island, Twin Island, Goose Island, Davids' Island, High Island, Rat Island, the Chimney Sweeps Islands, the Blauzes, and Travers Island. Hart Island, which is the second largest, formerly housed a prison, but is now uninhabited, and is currently used as a potters field. Along with David's Island, it has had a variety of military uses over the years, including its use as the site of Fort Slocum.