When the Marblehead Lighthouse first lit its flame in 1822, it drew on whale oil. The beacon flickered through lard, kerosene and LED lights over the next two centuries, while the tower weathered razing and reorganization. Despite the advent of GPS, the light still provides a solid basis for boats and ships to navigate the nearshore waters of the peninsula. The lighthouse's rich history boasts the first female keeper on the Great Lakes, as well as a place on Ohio license plates and on a U.S. postage stamp. James Proffitt gives an in-depth profile of the most photographed site in the state.