The Original Mad Scientist

Leonardo di ser Piero da Vinci is famously known as the ultimate Renaissance man, but behind the masterful strokes of the Mona Lisa lay a mind obsessively fixated on the morbid and the bizarre. Born out of wedlock in 1452, Leonardo grew into an eccentric genius who famously wrote all of his personal notes backward. This "mirror writing" wasn't necessarily a cryptic code to hide his secrets from spies; he was just a fiercely independent left-hander trying to avoid smudging his ink. Yet, it added an aura of dark mysticism to a man who spent an unusual amount of time lurking around morgues.

Corpses and Curiosities

To perfect his understanding of human anatomy, Leonardo became history's most artistic grave-robber. He procured and dissected over 30 human corpses by candlelight, peeling back rotting flesh to sketch everything from the cardiovascular system to the skeletal structure. His bizarre scientific experiments even included injecting molten wax into the brains of dead oxen to map their ventricles. When he wasn't up to his elbows in human remains, he was pitching utterly unhinged war machines to bloodthirsty dukes.

A Legacy of Unfinished Business

Despite his monumental intellect, Leonardo was a legendary procrastinator who left a trail of abandoned projects in his wake. Here are a few of his strangest conceptual achievements:

• The Renaissance Tank: He designed a massive, turtle-shaped armored vehicle loaded with cannons, but intentionally drew the gears backward so nobody could actually build it.
• Scythed Chariots: He sketched terrifying horse-drawn death traps with spinning blades designed to amputate enemy soldiers at the knees.
• The Mechanical Knight: He essentially invented a 15th-century robot—a knight powered by pulleys and cables that could sit up, wave its arms, and move its jaw.

In the end, Leonardo was a man entirely out of time—a brilliant visionary who left behind fewer than two dozen completed paintings but thousands of pages of spectacularly strange scribbles.