A 12,000-year-old “Stonehenge on steroids” transformed nomadic humans into members of complex societies.

When the late German archaeologist Klaus Schmidt discovered the world’s oldest known structures, he came up with a revolutionary theory about the history of human civilization: “First came the temple, then the city.”

This is how the first city got started 12,000 years ago

What Schmidt and his team dug up starting in the mid 1990s was a magnificent temple complex in southeastern Turkey, on a site called Göbekli Tepe, or “Potbelly Hill.” The stone complex, circular in structure with T-shaped pillars and elaborate carvings of humans and mythic animals, was built some 12,000 years ago—long before villages, pottery, and even agriculture. Yet, as a new video from the cultural nonprofit 92nd Street Y explains, it’s where the world’s first cities emerged, marking the turning point for when humans transformed from nomads into members of complex societies.

Some researchers believed it to be a religious gathering place where, as the journalist Andrew Curry reported for National Geographic, “hunter-gatherers might have traveled long distances to meet, worship and help build new monumental structures, sponsoring feasts to display their wealth.” Indeed moving those pillars (the largest weighing 16 tons) would have required hundreds of people, a thought that reinforced Schmidt’s theory.

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