Theatre of Thorikos - Credit: Wikimedia Commons
The Theatre of Thorikos (), situated north of Lavrio, was an ancient Greek theater in the demos of Thorikos in Attica, Greece. It holds the distinction of being the world's oldest known theater, dating back to its construction around 525–480 BC. The theater is unusual in its design, as it is elongated instead of the typical semicircle. Read more on Wikipedia
Source: en.wikipedia.org