The Colosseum or Flavian Amphitheater was begun by Vespasian, inaugurated by Titus in 80 A.D. and completed by Domitian.Above them is an attic story with Corinthian pilasters and small square window openings in alternate bays.Its monumental size and grandeur as well as its practical and efficient organization for producing spectacles and controlling the large crowds make it one of the great architectural monuments achieved by the ancient Romans.4	The construction utilized a careful combination of types: concrete for the foundations, travertine for the piers and arcades, tufa infill between piers for the walls of the lower two levels, and brick-faced concrete used for the upper levels and for most of the vaults.2	The amphitheater is a vast ellipse with tiers of seating for 50,000 spectators around a central elliptical arena.Below the wooden arena floor, there was a complex set of rooms and passageways for wild beasts and other provisions for staging the spectacles.At the outer edge circumferential arcades link each level and the stairways between levels.