One of the best preserved amphi theaters in Europe is the one in Plovdiv from the roman aera. It was buildt by the roman emperor Mark Avrelii during the II century A.D.
Today during summer operas are performed here.
http://www.zelvy.cz/bulharsko2003/085_plovdiv.jpg
See also this about Plovdiv:
http://www.plovdiv.org/
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