Leonardo Da Vinci

One of Leonardo's notebooks (left) contains an erased figure (right). Conservators discovered the hidden sketch using multispectral imaging.

How a Hidden Figure Emerged From One of Leonardo da Vinci’s Notebooks

Modern imaging reveals the approximately 500-year-old sketch

A scientist says a multispectral analysis of the Mona Lisa shows hidden portraits beneath the famous painting.

A French Scientist Says the Mona Lisa is Hiding a Portrait of Another Woman

Some art experts, however, are skeptical

A rendering of the USS Nautilus, the world's first atomic submarine. The real Nautilus is now open to the public, docked in Connecticut so that visitors can walk around inside and explore the torpedoes and living quarters.

Step Inside a Famous Submarine

Where to visit historic subs this summer—or ride in a modern one

Vitruvian Man

Da Vinci's Vitruvian Man May Not Have Been a Flawless Picture of Health

He may have had a hernia

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