From the ground up, Tuscan, Ionic, and then Corinthian was the standard Roman sequence of column types for multistory buildings, visible on the external facade of the Colosseum in the combination of barrel arch and framing columns.
Ornamental Greek orders frame the arches within the standard Roman sequence for multistoried buildings: from the bottom up, Tuscan, Ionic, then Corinthian.
Roman architecture was unlike anything that had precede. Roman architecture differed fundamentally from this tradition thanks to the invention, experimentation and exploitation of concrete, arches and vaulting.
The Colosseum is an oval amphitheatre within the center of town of Rome, Italy, just east of the Roman Forum.
The Romans also exploited the opportunities afforded to architects by the innovation of the real arch.
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