The notebooks of Leonardo da Vinci are considered one of the most valuable documents in the history of science, art and invention.
The Italian artist's notebooks contain a treasure trove of sketches and observations which have long puzzled researchers, offering a glimpse into his genius with his distinctive code, or "mirror writing".
In a stunning twist of history, scientists may have revealed the truth behind one of the artist's most mysterious sketches, connecting da Vinci's artistic genius with a hidden chapter of Italy's past.
A series of underground tunnels first sketched by da Vinci in 1495 have finally been found below a castle in Milan, Italy. The mysterious passages were rediscovered after 500 years under Sforza Castle, which was a medieval fortress built in the 15th century by the Duke of Milan, Francesco Sforza.
Read more on manchestereveningnews.co.uk