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flag Researchers discover tunnels under Milan's Sforza Castle, believed to be designed by Leonardo da Vinci.

flag Researchers at Politecnico di Milano have discovered underground tunnels beneath Milan's Sforza Castle, believed to have been designed by Leonardo da Vinci around 1495. flag Using ground-penetrating radar and laser scanning, the team found a network of tunnels, including a secret one for soldiers to use during a defense breach. flag This discovery highlights da Vinci's influence on Renaissance military architecture.

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