Two ancient North American structures collapsed within just nine days of one another — with one native tribe warning the "bad omen" points to impending doom.

Hundreds of acres in Michigan are covered in parallel rows of earth that are the remains of an ancient Native American agricultural system. The surprise find has archaeologists amazed.

Farming in Ancient North America: A millenniums-old settlement in Michigan has archaeologists rethinking the rise of agriculture on the continent. A How-To for the Samurai: ...