The Colosseum belongs to the Common Era — dated here to c. 80 CE at Rome, Italy. Dates mark a scholarly centre of gravity (dedication, completion, or iconic phase), not a single foundation day.
Vespasian and Titus opened an amphitheatre that could hold ~50,000 spectators — a concrete-and-stone machine for empire’s spectacles.
How it amazes the brain
Travertine façade, vaulted corridors, and a retractable awning system (velarium). The underground hypogeum later staged animals and scenery like a vertical theatre.
Why it counts as a wonder
It sits on the New7Wonders of the World list (2007 global poll) — a modern people’s roster of amazement.
Voted a New7Wonder in 2007. It still teaches how Romans industrialized entertainment.
On dating
CE means years after the traditional birth of Christ. A monument listed as c. 80 CE may have been founded earlier, rebuilt later, or become famous only in one phase. Engineering wonders (dams, tunnels, orbiting labs) are dated to opening or assembly.
This is story 1 of 100 in The Trend Ledger’s illustrated desk on world wonders raised after the birth of Christ — the companions to our BCE series.