The Two Harbors Light is the oldest operating lighthouse in the US state of Minnesota. Overlooking Lake Superior's Agate Bay, the lighthouse is located in Two Harbors, Minnesota. The construction of the Lighthouse began in 1891. The construction of the lighthouse was completed in 1892, the first lighting of the Two Harbors light was on April 14, 1892.The first Two Harbors Keeper was Charles Lederle and there were normally three Keepers assigned to make sure the light was lit 24 hours a day. The Lighthouse was built to provide safe passage into the Agate Bay Harbor during the early 20th century, as Two Harbors was the major shipping point for the iron ores of the Mesabi Range, far surpassing Duluth in importance.