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Built of limestone, yet one of the best-preserved Classical Greek structures in existence, this 4th-century-BC theatre is the undisputed highlight of Epidavros. It's renowned for its amazing acoustics; a coin dropped in the theatre's centre can be heard from the highest seat. The theatre seats up to 14,000 people. Its entrance is flanked by restored Corinthian pilasters and the foundations of the ancient stage are beyond the circle. It's now used for performances of Ancient Greek drama during the annual Hellenic Festival.