
The Colosseum was commissioned by the Emperor Vespasian between 70 and 72 AD and was completed in 80 AD by his son Domitian. It was built on a marshy site of a lake near the site of Nero's enormous palace. There was a colossus (a very tall statue) of Nero nearby, from which legend says the Colosseum's name was originated from, later destroyed in the great fire of Rome.
The Colosseum was cleverly designed. It has been said that most today's stadiums, and structures alike have been inspired by the concepts introduced in the Colosseum's building structure, even in modern times. It could be evacuated inearly in five minutes. The most inventive part of the Colosseum was its cooling system. It was roofed using a canvas covered net-like structure made of ropes, with a hole in the center to provide a breeze for the audience.