St. Mary's County, US
Point No Point Light, located in the Chesapeake Bay off the eponymous point several miles north of the mouth of the Potomac River, was constructed as part of a program to add lighted navigational aids in a thirty-mile stretch of the bay between Cove and Smith Points.
Listen to the audio guide for Point No Point Light Free on WIP — starts by itself when you arrive, even with the screen off