The acropolis was a fortified area in ancient Greek cities that housed important religious and civic buildings. The Parthenon, an ancient temple to the goddess Athena, is located on the acropolis in Athens. The Theatre of Dionysus, the first stone theatre ever built, was cut into the southern cliff face of the Acropolis in Athens and was the birthplace of Greek tragedy. Direct democracy, first established in Greece around the 500s BCE, only works for small groups living close together.