The Colosseum was one of the most famous buildings of ancient Rome. It is proof that the Romans were skillful builders. This huge building is oval in shape. It is about 620 feet(190 m) long, 510 feet (155 m) wide and 160 feet (50 m) high. Its four levels could hold more than 48,000 people.
The ancient Romans came to the Colosseum to watch men fight with wild animals. Specially trained men, called gladiators, also fought each other here. The ceremony that marked the Colosseum's opening in AD 80 included 100 days of games. Many men and animals lost their lives.
Canvas was used to cover the top of the Colosseum to protect spectators from the sun or rain while they watched the events. The center of the arena was designed so that it could be flooded and mock naval battles could be held. With 80 entrances, the spectators could enter and leave very quickly.