Split Lock guided ships along the north shore of Lake Superior from 1910 until 1969. Towering above a 130 foot cliff, it sends a beacon of light 22 miles into the lake, and it is ceremoniously lighted once each year. It is one of North American's most renowned lighthouse that is now maintained by the Minnesota Historical Society. (Postcard photos were taken by Dennis O'Hara and Lee Radzak)To see more vintage postcards, click here.
