Ancient Rome’s Holy Water Vending Machines
The first coin-operated machines were invented in Roman temples.

Salvator Rosa — "The Dream of Aeneas" (1660–65), public domain
Drop a Coin for Holy Water
Step into a Roman temple and see a brass contraption. Slip in a tetradrachm, and—clunk—a measured splash of holy water pours out. This wasn’t magic, but tech: the world’s earliest vending machine.
Hero’s Ingenious Invention
Hero of Alexandria described it around 50 CE. His device worked by a lever: the coin's weight opened a valve, releasing water. Talk about automation—centuries before soda cans.
Romans could buy holy water from a device that dispensed a measured amount when a coin was dropped inside. The engineer Hero of Alexandria described this ingenious machine in the first century CE.