The Roman Colosseum: Structure

The Roman Colosseum is one of the greatest architectural achievements of the Roman Empire.

(View of the Colosseum floor)

The Colosseum consisted of 4 levels, including the underground level with chambers used for keeping the animals and gladiators before the battles and hunts.

The seating levels of the Colosseum were organized by social class. The ground level seating was reserved for the emperor and the royal family; while the top level is for those with a lower social status, such as women and the poor.
The upper part of the Colosseum was originally made of wood, but was converted to stone after the year 223. The outer framework and structure of the Colosseum was composed of gigantic blocks of travertine, which is a type of limestone. The rest of the structure was composed of a softer, lighter stone, and was usually faced with marble.

The façade of the Colosseum included three times of columns following a strict order. Doric was at the bottom because if was the heaviest, following by Ionic and Corinthian. The floor of the Colosseum was a wooden floor covered in a bed of sand. For inclement or very hot weather conditions, an enormous, colored velarium, also known as an awning, could be stretched overhead to protect the crowd.

(Placement of the Awning)

The Colosseum rises about 161 feet high, 600 feet long and 500 feet wide, with a sand covered floor that they filled with water when they held mock naval battles. The interior was divided into three parts: the arena, the podium, and the cavea.

The Colosseum could hold up to 50,000 people but was designed so the stadium could fill within 15 minutes and evacuate in 5 minutes. The Colosseum had a total of 80 entrances, 4 entrances reserved for the Emperor and VIP gladiators.

(Gladiators)

Now more than two-thirds of the original building has been removed and the rows of the seats in the cavea are missing. They also removed the floor of the Colosseum so tourists could see the hidden underground level and chambers.

*Note: underlined words link to glossary