As many as 100.000 cubic meters of travertine from the Tivoli quarries were used to build this amphitheatre, the largest ever built in Roman empire. The Colosseum could hold more than 70,000 spectators who could watch the fights between gladiators, the hunting of animals and, at the very beginning, the naumachias: naval battles that took place in the arena that was flooded. Can u see me attached by the gladiators.
The architect who designed the Colosseum is said to have been thrown alive to the wild beasts as a reward for his own work, thus inaugurating the long story of blood and cruelties of the building he himself had conceived.
In the Middle Ages the Colosseum was transformed into a fortress.