Description Acrylic on canvas board. 86 inch original.Completed in 1831, St. Marks Light is the second-oldest light station in Florida. It is located on the east side of the mouth of the St. Marks River, on Apalachee Bay. During the American Civil War, the lighthouse was strategically important as an observation point and was defended by the Confederacy. It was shelled in 1865 by Union forces and had to be completely rebuilt following the war.