Three Things Built That Nobody Can Replicate A Roman glassmaker invented unbreakable glass in 14 AD — then was executed so the secret would die with him. A 12th-century engineer built self-operating machines with no power source. A 5,000-year-old Irish tomb lights its inner chamber for exactly 17 minutes, once a year, at sunrise on the winter solstice. Flexible glass: Rome, Italy. Al-Jazari automata: Diyarbakır, Turkey. Newgrange passage tomb: County Meath, Ireland. #history #mystery #unexplaine

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