Greece, where Classical drama was born in the 5th century BC, boasts scores of theatres that form a key part of the country's classical cultural heritage. But while about 30 are in a state to host cultural events, 76 are in need of urgent repair, they said.

"Ancient theatres need to be constantly preserved, some need to be restored, but what they mostly need is to be used," classical archaeology professor, Petros Themelis told Reuters.

Archaeologists said that ancient theatres should be part of every day life in order to be preserved.

"We might restore them, but nature will destroy them again (if they are not used)," Themelis said.

Another 28 ancient theatres are known to exist but have not yet been located or excavated, the archaeologists said.