Thomas Point Shoal Light

From http://www.uscg.mil/hq/g-cp/history/WEBLIGHTHOUSES/LHMD.html :

The current Thomas Point light is arguably the most widely recognized lighthouse in Maryland and is the only screw-pile light on the Chesapeake Bay still in its original location. (The remaining 3 have been moved to museum settings.) It is the third light to mark Thomas point shoal.

The Thomas Point Shoal Light Station dates back to 1824 when Congress appropriated $6,500 for construction and outfitting of a 30 foot, land-based, light tower, a small keepers dwelling, and a well.

The current screw pile structure dates to 1875.

In 1972 the Coast Guard announced that it was considering plans to automate the station and dismantle the cottage. The public rallied around the light and in 1975 it was made a historic landmark.

Thomas Point was the last manned lighthouse on the Cheseapeake, becoming fully automated in 1986.