Codex Forster I: Leonardo da Vinci Sketches Lead Researchers To Secret Tunnels In Milan's Sforza CastleIn a plot straight out of pretty much any Dan Brown book, ancient sketches by Leonardo da Vinci have revealed the location of secret tunnels underneath a medieval castle in Milan, Italy.In the 15th century CE, Francesco Sforza, Duke of Milan, ordered a fortification be built on the remains of...
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