Once only indicated through a sketch by Leonardo da Vinci from around 1495, concealed passageways have been discovered ...

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 ...

Leonardo sketched the secret routes hidden underneath the castle's defensive walls during his stay. "This passageway is immortalized in Leonardo’s drawings and has long been the subject of ...

Now, scientists have uncovered a hidden feature underneath a medieval castle in Milan, Italy, that researchers once could only speculate about based on a sketch ... outer wall of the castle.