[Romulus]

There is no coliseum in Rome. There is, however, a Colosseum.

[aculeus]

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.

[wimpycat]

Actually (pushing my nerdy glasses further up the bridge of my nerdy nose) it's the Flavian Amphitheater...or Amphitheatre if you're British.