20 miles south of Olympia, Washington, there's a strange sight: The ground is punctuated by hundreds of grass-covered mounds stretching over several hundred acres. These are known as the Mima Mounds, and after decades of research, nobody knows what caused them. Although scientists and explorers believed they'd solved the puzzle of this mysterious land formation at various times, virtually every one turned out to be wrong. You still have a chance to be the hero. Determine how these mimas came to be all in one place and you'll go down in the history books.
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Written by Heather Larson August 16, 2018
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