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Theopetra Caves – 21000 BCE

Greece

This might not be the most gorgeous site on the list, but it’s got the most historical significance. This is the oldest manmade structure on earth, when humans carved out the cave from the surrounding limestone cliffs. Starting 50,000 years ago until 4,000 people consistently lived here, marking the transition from Neanderthals to modern humans.

That’s old.

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These Structures Were Built Long…Long Ago…
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