What is the oldest man made structure in the US?

A new study shows the LSU Campus Mounds are the oldest known human-made structures in North America. The study, led by Brooks Ellwood, a professor emeritus of geology and geophysics at LSU, used radiocarbon dating to determine that construction of the first mound, mound “B” began around 11,000 years ago.



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Robert Schoch notes that for centuries, starting in the period of the New Kingdom and throughout Roman times, the Great Sphinx of Giza was considered to have been built before the Pyramids. Oral traditions of villagers who live in the Giza area date the Sphinx to 5000 b.c., before Khafre's time.

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Sites like Cactus Hill are thought to be more than 16,000 years old. Are there any ancient structures in the United States? The United States has a surprising number of ancient sites, like the Cahokia Mounds of Illinois, the cliff dwellings of Mesa Verde, and the sprawling ruins of Bears Ears National Monument.

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Knap of Howar, Orkney The UK's oldest surviving building is this Neolithic farmstead on the island of Papa Westray in Orkney.

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About 8,000 years ago, during a damp era known as the African Humid Period, during which much of the Sahara was covered in lakes and grasslands, the region around Giza was underwater.

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Stonehenge was constructed about 4,500 years ago at around the same time as the Sphinx and the Great Pyramid of Giza in Egypt. Despite their differences, these distant sites had much in common.

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