In a twist worthy of a Renaissance mystery, Leonardo da Vinci's sketches have revealed hidden secrets beneath the Sforza ...

An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to ...

There's a hidden drawing underneath the "Mona Lisa" — and it shows that this masterpiece almost looked very different.

A Louvre expansion that would put La Gioconda in her very own gallery has us envisioning the most mysterious sitter in iconic rooms of art history.