An atlas of Earth’s mysterious places — megaliths, pyramids, lost and sunken cities — with the evidence shown plainly: what is verified, what is contested, and what is still unknown.

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Embankments tagged “pipestone”

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🇺🇸 United States · Earthwork

Turner Earthworks

Middle Woodland (Hopewell) · Hopewell (Ohio Hopewell)

Hopewell earthworks (200 BCE–400 CE) on Little Miami — 300-m Great Enclosure and pipestone pipes at Cincinnati.