Once only indicated through a sketch by Leonardo da Vinci from around 1495, concealed passageways have been discovered underneath the Sforza Castle in Milan, Italy.

A mysterious network of tunnels, hidden underneath a medieval castle, sketched by Leonardo da Vinci has been finally uncovered by scientists. The discovery was made after a series of surveys that were conducted to digitise 15th-century Sforza Castle's underground structures using ground-penetrating radar and laser scanning.

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 GROUNDBREAKING discovery has unearthed mysterious tunnels which may have been sketched by Leonardo da Vinci over 500 years ago. The Italian genius, who was a revolutionary mathematician but also

Researchers may have found the hidden tunnels beneath a castle in Milan that Leonardo da Vinci sketched in 1495.

Researchers in Italy may have uncovered underground tunnels beneath Milan’s Sforza Castle that were once only known through a sketch by Leonardo da Vinci, according to a report by CNN.

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