Hero of Alexandria's Steam Engine
10–70 CE
Hero of Alexandria described and built the aeolipile — a rotating steam-powered sphere — in the 1st century CE. It is the first recorded steam engine in history, predating the Industrial Revolution by 1,700 years. Hero also described a coin-operated vending machine, automatic temple doors, and a programmable cart. None of his inventions were industrialized.
The Ptolemy World Map
150 CE
Claudius Ptolemy's Geography, written around 150 CE, provided coordinates for 8,000 locations and instructions for creating a world map using two different map projections. It was the most accurate world map for 1,300 years. When rediscovered in the 15th century, it directly inspired the Age of Exploration — Columbus used Ptolemy's (incorrect) estimate of the Earth's circumference to argue the Indies were reachable by sailing west.