Situated on the beautiful shores of Lake Superior is arguably Minnesota's most famous residence, the Glensheen Mansion. Also known as the Cogndon Estate, the Glensheen and 7.6 acre grounds offer a glimpse of early 20th century wealth and elegance. Finished in 1908, the mansion was built when Duluth was a bona fide boom town, thanks to rich iron ore mines in areas surrounding the city. At the time of completion, Duluth had more millionaires per capita than any city in the world!