Smithsonian Magazine on MSN4d
Secret Passageways Recorded in Leonardo da Vinci’s Sketches Discovered Beneath a Medieval Castle in MilanUsing ground-penetrating radar and laser scanners, researchers identified subterranean structures just a few feet below the ...
Since 1997, using only Middle Ages tools & technology, a group has been building a medieval castle in a French forest. In the hea ...
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