In the shadow of two active volcanoes, there’s a stretch of land in Washington State where the earth has goosebumps. Hundreds of knolls dot a prairie at Mima Mounds Natural Area Preserve, a rare ...

A new twist on an old mystery may finally settle the debate over the origin of Mima mounds, which bulge out of the ground like enormous, grass-covered bubble wrap. Mima mounds (sounds like dime-a) ...

One of the world's weirdest landscapes, Mima mounds are found on every continent but Antarctica. These rounded little hills are spaced evenly on flat grasslands, covering the prairie like upended egg ...