Antikythera Spear Thrower
2nd–4th century CE
Over 100 Roman dodecahedra — hollow bronze objects with 12 pentagonal faces, each with a circular hole of different diameter — have been found across the Roman Empire. No written record mentions them. No one knows what they were used for. Theories range from surveying instruments to candle holders to knitting tools.
Hypocaust Underfloor Heating System
100 BCE – 400 CE
The Roman hypocaust — a sophisticated underfloor heating system using hollow pillars to circulate hot air — heated entire buildings to comfortable temperatures 2,000 years before modern central heating.
Lycurgus Cup
4th century CE
A 1,600-year-old Roman glass cup that appears jade green in reflected light but glows blood red when light shines through it. Scientists discovered in 1990 that this effect is caused by gold and silver nanoparticles embedded in the glass — a nanotechnology application that was not replicated until the 20th century.
Lycurgus Cup Nanotechnology
400 CE
The Lycurgus Cup appears green in reflected light but glows red when lit from within — a 1,600-year-old Roman glass cup that uses gold and silver nanoparticles to achieve this effect, demonstrating ancient nanotechnology.
Roman Dodecahedra Mystery
200–400 CE
Over 116 Roman bronze dodecahedra have been found across Europe — hollow 12-faced objects with holes of different sizes on each face — and after 200 years of study, archaeologists have absolutely no idea what they were for.