The Colosseum

The Colosseum

The Colosseum is an amphitheater with a complex series of arches and

stone. Construction was started in 72 A.D. in the city of Rome, Italy. The Colosseum was

inaugurated in 80 A.D. but was still uncompleted. The Colosseum was constructed by the

Romans and has a rich and interesting history. The first step in building the Colosseum

was laying the foundation.

To lay the foundation for the superstructure the Romans engineers had to

first drain former emperor Nero's stagnum, artificial lake, in 72 A.D. (Nardo 35). After

the stagnum was drain the ground had to be prepared so the foundation could be laid. The

Roman surveyors used a chorobate to level the ground for the foundation (Nardo 35). The

foundation had to be perfectly level. If not the foundation could crack and would not able

to support the millions of tons of stone, wood, people, and animals. The Colosseum's

foundation was made up of the newly invented material, concrete. The Roman concrete

was made of wet pulvis puteolanus, sand, and gravel (Nardo 37-38). The foundation was

approximately forty feet thick and one-hundred and seventy feet wide.

From the foundation was a twenty foot wall of concrete that was used to

support the buildings outershell of walls and piers (Nardo 38). The Colosseum's skeleton

was composed of the walls, piers, and arches. The Roman builders used a groma to

ensure that the Coloseum's skeleton was perpendicular to the foundation (Nardo 38). The

piers that supported the Colosseum were made of travertine (Nardo 39). Travertine is a

kind of limestone that is strong and durable (Nardo 39). The walls between the travertine

piers were made of concrete and were faced with bricks of tufa (Nardo 39). Tufa is a

stone compressed with volcanic ash (Nardo 39).

Each level of the Colosseum is unique in its own way. The chambers

beneath the Colosseum were used for temporary quarters for the gladiators and other

performers. Lions, bears, elephants, and other animals were caged in the chambers, too

(Nardo 38). There was also mechanical elevators that were used to transport both humans

and animals to the arena floor (Nardo 38). Cryptoporticis, long entry and connecting

corridors, were also found in this underground complex (Nardo 38).

The arena is where all the action took place. The arena was covered by at

least fifteen centimeters of sand (Hopkins). The Romans sometimes put red dye in the

sand to disguise the blood that was in the sand (Hopkins). The arena is littered with many

trap-doors, to let animals leap out into the ensuing battle (Hopkins). Sea fights occurred

on the arena when one meter of water was allowed in to the arena.

The upper levels (levels one-four) were built during the last years of the

Vespasian's reign and the beginning of Titus's reign as emperor (Nardo 44). The first

level was thirty-four feet tall; second level was thirty-eight feet tall; third level was

thirty-eight feet tall; and the fourth level was forty-four feet tall (Nardo 44). The total

height of all four levels was over one-hundred and fifty-six feet tall. Each level had

varying numbers of seating rows in the cavea (Nardo 45). The cavea is the seating

complex (Nardo 45). Each seating section had numerous exits. The exits lead into straight

barrel-vaulted corridors (Nardo 45). This corridors then fan away toward the buildings

outer perimeter (Nardo 45).