Cloaca Maxima belongs to the years before the Common Era — dated here to c. 600 BCE at Rome. The date is a scholarly centre of gravity, not a foundation-stone timestamp.
Rome’s “greatest sewer,” begun under the kings, turned a Forum marsh into a city by putting the swamp underground.
How it was made
Etruscan engineering, later stone vaults. It still drains into the Tiber — a working archaic monument.
Why it still counts as a wonder
It never needed a Greek list to be a wonder: the labour, the alignment, or the survival is enough.
Not pretty. Civilisation as drainage: a wonder you smell in the sources and thank in the streets.
On dating
BCE in this series means years before the traditional birth of Christ, counted backward. A monument listed as c. 600 BCE may have been founded earlier, rebuilt later, or famous only in one phase. Where ancient writers disagree — as they do for Babylon’s gardens — we say so.
This is story 65 of 100 in The Trend Ledger’s illustrated desk on world wonders raised before the Common Era.