Ancient Technologies We Still Can't Explain

The Antikythera mechanism, found in a shipwreck dating to around 65 BC, was an analog computer over 2,000 years old containing at least 30 precision-cut bronze gears.

The Antikythera mechanism could predict solar and lunar eclipses, track the positions of the five known planets, calculate Olympic Games dates, and model the moon's irregular orbit.

Humanity did not create anything as mechanically complex as the Antikythera mechanism for another 1,400 years after its construction.

Scientists have not been able to fully replicate the Antikythera mechanism despite over a century of study.

Byzantine ships used liquid fire projected from tubes that burned on water and could not be extinguished, decimating the Arab fleet.

Modern chemists have been unable to recreate Greek fire, as some of its described properties actively contradict each other chemically.

Swords made from Damascus steel in the early Middle Ages were legendary for their sharpness and ability to cut through other swords and silk scarves.

Carbon nanotubes, considered cutting-edge nanotechnology, were forged into Damascus steel swords 800 years before their modern discovery in 1991.

Modern concrete typically crumbles after about 50 years, requiring billions of dollars in annual maintenance.

Around 500 BC, the Nazca people of Southern Peru created enormous drawings, some over 1,200 feet long, only truly visible from the air.

The Walls of Sacsayhuamán, an Inca fortress in Peru, are made of limestone blocks weighing up to 130 tons each, fitted together without mortar so precisely that a piece of paper cannot slide between them.