The ancient Greeks built a large complex at Delphi which included a temple to Apollo, a treasury, a theatre, a gymnasium and a stadium, among other monuments. Most of these building were constructed between the 6th century and 4th century BC. Delphi was also home to the Delphic Oracle and was a site of considerable importance in the ancient world. Most of the buildings are in ruins now, though it is easy to get a sense of what the place was like was like 2,500 years ago. The open air theater, pictured here, could seat 5,000 people and offered a spectacular view over the whole complex and it's surrounding landscape.