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Rapa Nui
You would know the Rapa Nui as the original inhabitants of Easter Island who built those famous statues with the large heads. Being such a remote place, how the Rapa Nui got there in the first place is as unexplainable as their disappearance. Some theories on how they vanished include starvation as a result of over-consumption of resources, leaving the island to settle elsewhere, or possibly both.
