Colosseum is an elliptical shape building with a short axis of 156m, and a long one of 188m.
It stood 50 meters high, 190 meters long and 156 meters wide. The structure of the Colosseum was built of several different
materials: travertine blocks were used for load-bearing pillars and external walls, stairs and radial walls were build from blocks and bricks of tufa.
Arches and vaults supported the structure solidly. According to some calculations, the Colosseum could accommodate between 50,000 and 80,000 spectators. It had 80 entries and exits, 76 of which were used by ordinary citizens, while the remaining four were intended for the emparor, political and religious authorities and for the protagonists of the spectacles