Marblehead, the oldest lighthouse still standing on the Great Lakes, was known in 1821 as Sandusky Light Station until the Lighthouse Board changed its name in 1870. The old, conical, white tower has remained in its original state, except for the replacement of the upper eight feet of stone tower with a vertical brick wall to enclose a watch room. Throughout the years, the lighthouse has utilized thirteen lights and reflectors, a fourth-order lens, and, in 1903, a third-order lens. Today, the lighthouse is still in use as an active aid to navigation. Its original lens is now on display at nearby Marblehead Coast Guard Station.