Poverty Point

Eight hundred years after the pyramids at Giza and before the Maya raised anything, hunter-gatherers in northeast Louisiana built one of the most ambitious earthworks on the planet. Poverty Point — six concentric semi-elliptical ridges nearly three-quarters of a mile across, five mounds, a flat central plaza — was constructed between 1700 and 1100 BCE by people who had no agriculture, no wheels, no draft animals, and no metal. They moved fifty-three million cubic feet of soil, basket load by basket load, in what the Park Service estimates was five million hours of labor.

Mound A — the Bird Mound — is seventy-two feet tall, the second-largest earthen mound in North America, and was probably built in a single construction event that took less than ninety days. Nobody knows exactly what Poverty Point was for — a city, a ceremonial center, a trading hub — but the artifacts answer part of it: the site sat at the center of a trade network that pulled copper from the Great Lakes, flint from the Ohio Valley, soapstone from the Appalachians, galena from Missouri. The 'Poverty Point objects' — thousands of hand-shaped clay cooking balls used in earth ovens — are found across the lower Mississippi Valley.

Then it stopped. Around 1100 BCE the site was abandoned and the culture that built it vanished, leaving no descendants who claim it and no explanation for the abandonment. The mounds sat in the cotton fields of a nineteenth-century plantation — which gave the site its incongruous name — until archaeologists recognized the ridges in the 1950s. UNESCO listed it as a World Heritage Site in 2014; less than one percent of the site has ever been excavated.

The mystery of Poverty Point isn't supernatural — it's the plain documented fact that a society sophisticated enough to organize five million hours of communal labor simply stopped, and nobody knows why. The mounds keep the question.