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Da Vinci was right: Secret tunnels found in Italian castle

Summary by Popular Science
Italy’s famed Sforza Castle is a focal point for historians, architects, and art lovers—as well as a source of many legends. One of the most prominent rumors surrounding the over 575-year-old fortress has long been the existence of secret passageways beneath the grounds originally hinted at by Leonardo da Vinci. But according to recent, ground-penetrating radar and laser scans, da Vinci’s references to underground tunnels aren’t myths—they’re re…
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