The Theatre of Epidaurus was built in the 4th century BC by Polykleitos the Younger and thankfully for it remote location much of it is still intact today, never having the pilfering as other ancient sites have had over the millennia. The theatre became over grown and buried, believed to be just a hollow in the side of a hill until it was discovered in the 19th century.
Theatre is 114m (374ft) across and has 35 rows of seats divided into 34 blocks by stairs and walkways. The bottom tier of 12 blocks was the original theatre built in the 4th century BC, the top tier of 21 blocks was built much later during the Roman period.
The orchestra or stage is 20m (60ft) and the only one to survive from antiquity. Supposedly if you drop a pin in the centre of the orchestra you can hear it hit the ground from any where in the theatre. The theatre is still in use today with actors coming from all over the world to perform there.