A team at the Polytechnic University of Milan uncovered secret tunnels beneath Sforza Castle, potentially linked to Leonardo da Vinci's designs.

Researchers have discovered hidden tunnels beneath Milan’s Sforza Castle, which may have been used for military defense, possibly connected to Leonardo da Vinci’s designs. The underground passageways uncovered include a previously unknown tunnel and structures suggesting real-world influence from Da Vinci’s architectural sketches.

A series of underground passages have been found under Sforza Castle in Milan by experts at the city's Polytechnic University.