Zhang Heng Built a Seismoscope in 132 CE
The Chinese scientist's device is thought to have detected distant earthquakes.
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The Pharos of Alexandria Was One of the Seven Wonders
Built in the 3rd century BCE, the lighthouse stood roughly 100 meters high.
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Romans Heated Buildings With a Hypocaust
Hot air flowing beneath floors and through walls warmed baths and villas.
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The Lycurgus Cup Contains Gold and Silver Nanoparticles
The 4th-century Roman glass appears green in reflected light and red when lit from behind.
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Roman Aqueducts Carried Water Over Long Distances
Structures such as the Pont du Gard in France still stand today.