Soudan, Minnesota: Deepest Place You Can Go In America

A mysterious fire threatened the Soudan Mine over the weekend, but firefighters poured foam as thick as whipped cream down its half-mile shaft, smothering the flames. At the bottom of the mine, mysterious experiments in the Soudan Underground Laboratory were reportedly kept safe by automatic doors that are normally used to keep out bats (The bats were also reportedly okay). There's no word on when the water and foam will be pumped out, but it's expected to be fairly soon, and the mine appears to be on track for its usual May opening for tourists. [RoadsideAmerica.com Team, 03/22/2011]