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Have you ever looked at an old building or monument, and wondered how people living hundreds of years ago could possibly have built it? If so, you’re not alone. Many scientists have asked themselves the same questions, and they haven’t always been able to come up with answers. There are many examples of puzzling objects, artifacts, and buildings in the world that scientists can’t adequately explain away, and we’ve put some of the most mystifying examples together for you in this video!

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