In Lake Huron, Underwater Treasures, And A Marine Sanctuary, Boost Tourism Industry by veronicavolk published on 2016-07-27T16:41:49Z Alpena, Mich., has turned the shipwrecks off its shores into a tourist attraction. Now, other Great Lakes towns are hoping to create freshwater marine sanctuaries of their own. This piece originally aired on NPR's All Things Considered. Genre News & Politics