This lighthouse is at the southernmost tip of the western peninsula of Maryland, at the confluence of the Potomac River and Chesapeake Bay. It was built in 1830 by John Donahoo, a master lighthouse builder.
Below is a letter I found online from the U.S. Treasury Department notifying the appointment of Ann Davis, as the new keeper to follow her father who had passed four days before.
There was a kiosk by the bathhouses at the beach with an old map of the lighthouses built by one engineer.
The original purpose of the quaint old building below was not clear and no one thought to inform us. It was within sight of the lighthouse.