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What made the South Puget Sound Prairie's mysterious Mima Mounds? We try to find the answer, but only learn one thing that's certain: they're a beautiful place to visit in spring when the wildflowers are blooming!

For more information on the Mima Mounds visit http://www.southsoundprairies.org/visit.htm

Read or Share this story: http://www.king5.com/story/entertainment/television/programs/northwest-backroads/2014/07/30/12868906/