Watch Hill, Rhode Island
One point of interest in Watch Hill is the ruins of Fort Mansfield. The ruins are an old coastal artillery post at the very end of Napatree Point. It was one of a series of such forts. They were constructed to guard the eastern entrance to Long Island Sound as part of the coastal defense network for New York City during the Spanish–American War. It was in operation between 1901 and 1909. Then it was closed down over the course of several years. The land was sold in 1926. All the government structures were torn down in winter 1928–29. The three concrete gun emplacements were left behind. They remain there as of October 2021. They usually offer tunnels and underground rooms to explore. Occasionally at low tide, some remains can be seen of the Battery Connell.