A century or so before the pyramids graced the Egyptian horizon, around the same time as the erection of Stonehenge, hunters and gatherers half a world away were building megalithic stone structures to rival those of farmers.
Two University of Wyoming anthropology professors have discovered one of the earliest circular plazas in Andean South America, showcasing monumental megalithic architecture, which refers to construction that uses large stones placed upright with no mortar.
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