Delphi's theater. Because the Pythia (Priestess of Delphi) only gave oracles one day a month there was often a 'backlog' of oracles. Delphi in turn developed a full complement of entertainment and athletic facilities, including this theather, a stadium, baths, and a gymnasium. Visitors didn't mind waiting I imagine -the multitude of sacrifices being performed (one needed to sacrifice to even see if an oracle could be taken on a certain day) would have provided a lot of food.