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Da Vinci's secret tunnels at Milan's Sforza Castle appear to be nothing more than sewers

Summary by Le Monde
Researchers from the Politecnico di Milano claim to have discovered mysterious underground passages beneath the medieval fortress that match sketches by the Italian master. But historians specializing in the period sharply dispute this theory.

Bias Distribution

  • 100% of the sources lean Left
100% Left

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Le Monde broke the news in Paris, France on Saturday, December 20, 2025.
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