The concrete is better than ours
The PANTHEON's dome has stood unreinforced for nineteen centuries and is still the largest unsupported concrete dome on Earth. Modern concrete, reinforced with steel, typically needs major work within a hundred years, because water reaches the steel and it rusts and splits the structure from inside.
Roman concrete does the opposite: it heals. Researchers in Massachusetts found in 2023 that lumps of quicklime in the mix, long assumed to be sloppy mixing, react with water seeping into a crack and recrystallise, sealing it. Their sea walls have actually strengthened over two thousand years of wave action, because seawater reacts with the volcanic ash in the mix to grow new minerals. We only worked out how it functioned very recently.
Rome ran on water
Eleven AQUEDUCT lines fed the city, most of them underground rather than the famous arches, delivering something in the region of a million cubic metres a day. The gradient had to be shallow and unbroken over distances of fifty miles or more — the Aqua Claudia drops about a metre every three hundred, surveyed with a wooden frame and a plumb line.
Most of it was not for drinking. It fed public baths, fountains and latrines, and ran continuously because there were no taps to shut. The overflow flushed the sewers. When the aqueducts were cut during the Gothic wars in the sixth century, the city's population collapsed from perhaps a million to a few tens of thousands, and Rome did not reach a million people again until the twentieth century.
The Republic ended without anyone announcing it
The REPUBLIC had no king for nearly five hundred years and was proud of it. What replaced it never formally said so. AUGUSTUS kept the SENATE sitting, kept the elections running, kept the old job titles, and called himself princeps — first citizen. He held no crown and claimed no new office.
What he held instead was every meaningful power at once: command of the army, control of the provinces that mattered, the tribune's veto, and the money. The forms survived and the substance did not, and historians still argue about the exact date the EMPIRE began. CAESAR's assassination in 44 BC was meant to save the Republic; it produced fourteen more years of civil war and then a permanent EMPEROR.
What the grid holds
The LEGION and its CENTURION, the marching SOLDIER, the TOGA — worn only by male citizens and so unwieldy that most Romans avoided it whenever the rules allowed. The FORUM, the MARBLE, and the LATIN that survives inside English, Spanish, French, Italian, Portuguese and Romanian. The MARBLE is misleading too: Roman statues and temples were brightly painted, and the austere white look we copied for banks and museums is just the pigment having weathered off.
Also the spectacle: the COLOSSEUM, the ARENA, the CHARIOT racing that was considerably more popular than the GLADIATOR fights and killed more people, and ROMULUS, who according to the founding story murdered his brother over a boundary wall. Our Roman mythology page covers the gods; this one is about the plumbing and the politics.