There is no coliseum in Rome. There is, however, a Colosseum.
There is no coliseum in Rome. There is, however, a Colosseum. There is no Colosseum in my Random House Webster's. There is, however, a coliseum: "a large building for sporting events, exhibitions, etc." .
Coward that I am, I checked before posting my # 56. But I defer to the mighty Romulus ... in matters Romeous.
Actually (pushing my nerdy glasses further up the bridge of my nerdy nose) it's the Flavian Amphitheater...or Amphitheatre if you're British.