Odeon-of-Agippa

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The Odeon of Agrippa was a large concert hall located in the centre of the Ancient Agora of Athens. It was built about 15 BCE, occupying what had been open space in the centre of the agora. It was a gift to the people of Athens by Marcus Vipsanius Agrippa, a Roman statesman and general. The two-storey auditorium seated around 1,000 spectators and was equipped with a raised stage and marble-paved orchestra. On three sides it was surrounded by a subterranean cryptoporticus with stoae above. The building was decorated externally with Corinthian pilasters. The main entrance for spectators was originally on the south side of the building, with access from the terrace of the Middle Stoa. The north facade only had a small portico to give access to the stage. Unfortunately the 25 metres (82 ft) of the auditorium eventually caused the roof to collapse in around 150 CE. The Odeon was rebuilt as a smaller lecture hall, seating only 500 and a more elaborate facade was added to the north side. (from Wikipedia)