This post is very special to me, I was fortunate to be able to see the Colosseum of Rome live. this happened when I was studying Italian language and made a study trip.
The Colosseum, (the Flavian Amphitheatre) is one of Rome's most famous buildings and enduring monuments to the culture of the ancient Romans. Construction was initiated by the Emperor Vespasian around 72 AD.
The huge theater was originally built encompassing four floors. The first three had arched entrances, while the fourth floor utilized rectangular doorways. The floors each measured between 10,5-13,9 meters (32-42 feet) in height. The total height of the construction was approximately 48 meters (144 feet). The arena measured 79 x 45 meters (237-135 feet), and consisted of wood and sand. (The word "arena" is derived from the Latin arena, which means "sand.") Nets along the sides protected the audience.
The Colosseum had a total spectator capacity of 45,000-55,000. The Amphitheater is built of travertine outside, and of tufa and brick in the interior. The main pedestals were built of marble blocks weighing 5 metric tons (11,000 pounds.) Initially the huge marble blocks were held together by metal-pins. However, the pins were soon carried off by thieves, and had to be replaced by mortar.
The audience, upon entering, climbed sloping ramps to their seats, according to gender and social class. A wooden floor covered subterranean chambers where the gladiators and animals were kept waiting to perform. There is some debate over the idea that the Colosseum was occasionally flooded for mock naval battles. There were canals in place that could have been used for this purpose but the brick used in construction was not the same type of material that they normally used in water resistant materials.
The Colosseum was the Empire's primary stage for gladiatorial combat for nearly 4 centuries. In a show of Rome's wealth and extravagance, during the opening ceremonies in 80 AD, 100 days of the games were held.