In the late 1800s and early 1900s, Duluth's booming lumber and iron ore industries created so much wealth that the area claimed to have more millionaires per capita than any other city in the nation. Visit the 1908 Glensheen, The Historic Congdon Estate, built by one of Duluth's mining barons, located on seven beautifully landscaped acres along Lake Superior. (888) 454-4536; glensheen.org
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