the.com/colosseum

Rome's bloodiest stage, where the floor could vanish and a flood became the sea.

means A large amphitheatre or stadium, especially the great ancient one in Rome, built for public spectacles like gladiatorial combat — and by extension any vast arena for performance or sport.

from From Latin Colosseum, a name tied to the colossus — a giant statue of Nero that once stood nearby (itself from Greek kolossos, a huge statue). The Romans actually called the building the Amphitheatrum Flavium, after the Flavian emperors who raised it; the nickname 'Colosseum' stuck because of that towering neighbour, and it later spread to mean grand arenas everywhere, sometimes spelled 'coliseum.'

Naval battles
Early on it was flooded for staged sea fights
Body count
Up to 400,000 people died inside it
Awning crew
Sailors worked the giant retractable sunshade
Quick exit
50,000 spectators could empty in minutes
Stone thieves
Half of it was looted to build palaces
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