Skip the long ticket line and go straight to the fast track entrance for security checks. After entering the Colosseum at your allotted time, relive the stories of emperors and gladiators. Begun under the emperor Vespasian in 72 AD, and completed by his son Titus in 80 AD, the Colosseum was the largest amphitheater ever built. Imagine the ferocious fights between man and beast, as you stand in the elliptical arena, comprised of 4 levels, and once able to seat up to 73,000 spectators.