U.S. Shot Furnace
This structure is a hot shot furnace for heating cannon balls to be shot at wooden vessels and to set them on fire. It is part of the water battery built by the U.S. (1842-44) when this side of the moat was filled in and guns were mounted on the stone arcs behind the sea wall.
Marker can be reached from South Castillo Drive (State Highway A1A), on the right when traveling north.
Courtesy hmdb.org
