The results were far more significant and intriguing than we had anticipated, BiolotoldLive Science.

We uncovered rooms on a second underground level and an additional passage running parallel to the known one.

But now, thanks to technology, it seems that its existence can be confirmed.

Leonardo da Vinci’s 1495 sketch may depict previously undiscovered underground passageways in Sforza Castle.

Self-Portrait of Leonardo da Vinci, ca. 1505. (Photo: Museum of the Ancient People of Lucania, viaWikimedia Commons, Public domain)

Self-Portrait of Leonardo da Vinci, ca.

Sforza Castle in Milan.

Leonardo da Vinci’s 1495 sketch may depict previously undiscovered underground passageways in Sforza Castle.

Sforza Castle in Milan. (Photo: Jakub Hałun, viaWikimedia Commons, CC4.0,3.0,2.5,2.0,1.0)