Winters in Minnesota are cold and the best way to get through the bone-chilling season is to have fun with it, just like Roger Hanson does. For the last four years the ice builder has been growing ice castles in his front yard with the help of his geothermal heating system, some fancy sprayers and a computer program he created himself. Each year the crystalline castles at Hanson's Winter Water Wonder are getting bigger and bigger with more intricate rigging systems and more complicated programming.
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