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On Thursday, British authorities charged a pair of climate change activists for vandalizing Stonehenge, a prehistoric megalithic structure on a chalk plateau known as the Salisbury Plain.

Neolithic farmers started to use massive blocks of stone to build monuments, including Stonehenge and dozens of megalithic tombs still visible across France and the British Isles.

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.

People watch the midsummer sun rise over the megalithic monument of Stonehenge on June 21, 2005, in Salisbury Plain, England.

But they also discovered 24 previously unreported humanmade constructions all over the basin, including suspected ceremonial sites, fortified villages, and megalithic structures, some of rising only 1 meter or so above the forest floor.