The Dry Tortugas Light is located on Loggerhead Key, three miles west of Fort Jefferson, Florida. The Loggerhead Key lighthouse has a stone foundation and a conical brick tower. The walls are 6 feet (1.8 m) thick at the base and taper to 4 feet (1.2 m) thick at the top. The tower was painted black on the upper part and white below (later unpainted on the upper part and white below). A radio room is attached to the base of the tower. The original lens was a first order Fresnel lens, which is now on display at the United States Coast Guard Aids to Navigation School in Yorktown, Virginia.