The Colosseum in Roma, Italy started construction in 70 AD. The architects were Titus, Vespasian, and Domitian. The invention of concrete was just introduced. Thus, them using a mixture of stone, concrete, and bricks. It is the largest colosseum built holding 80,000 Romans. It is symmetrically balanced by using a repetitive pattern of arch-shaped in regular rhythms; it also added more light to the arena. They also used a Greek style of columns on the walls of the arches that served no structural purpose but was merely aesthetic.