USA - Monumental Earthworks of Poverty Point

"Monumental earthworks of Poverty Point owes its name to a 19th century plantation close to the site. It is located in the Lower Mississippi Valley on a slightly elevated and narrow landform. The complex comprises five mounds, six concentric semi-elliptical ridges separated by shallow depressions and a central plaza. It was created and used for residential and ceremonial purposes by a society of hunter fisher-gatherers between 3,700 and 3,100 B.C. Research has not clarified yet whether the complex had a steady residential function or was a campground occupied temporarily during ceremonies of trading fairs. It is a remarkable achievement in earthen construction in North America that was not surpassed for at least 2,000 years."

Source: UNESCO World Heritage