Concordia University

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Students walk in tunnels connecting dorms to academic buildings at Concordia University Wisconsin Tuesday, Jan. 28, 2014 in Mequon, Wis. While many Midwestern college students pile on layers to brave the frigid walk to classes in subzero weather, those attending Concordia on the windy shores of Lake Michigan can leave their coats in their dorms and take a much cozier trek using the schools 4 miles of connecting tunnels and hallways. (AP Photo/Gretchen Ehlke)