The exterior is of travertine, formed
by 41 arches framed by pilasters, whereas the radial
walls and the ambulatories were built in square work,
consisting of blocks of tufa, cement work and reticulated
work.
Today only the two lower stories in
Doric and Ionic style are preserved. The stage was flanked
by two rooms with apsis followed by a large exedra with
two little temples.
It was originally 32 mt high and could
hold about 15000 spectators.In the Middle Ages it was
transformed into a fortress.
In the 1500's the noble family of Savelli
transformed it into a palace (which was built by Baldassarre
Peruzzi).
The building passed then to the Orsini
family in the 1700's
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