![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihpN1uDZCybUcCPsGXHbki3nj5r_rTdPYzTnFh8OEEP74RDSoH8lp5C8fum0AhCUp-7mf_iiC1PG4WXgy-9ICAiCntKXhV5_yRAnkTMd84nZxXbiHXx0x2zw51EwC7pHAakQSqFBikyLT1_hit/s1600/goexmima.jpg)
Mima mounds are 6-foot-tall, 30-foot-wide domes of dirt that cover the open prairie on Washington's Puget lowlands. They are so large and uniform, it's hard not to feel they must be man-made. But nobody actually knows who or what made them. They are a scientific mystery.
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