This is the famous Parthenon.  Dedicated to Athena, then rededicated as a Catholic church, then used for gunpowder storage, which is the reason it looks like it does today.  This is one of the most recognizable sites of Greece.  The columns are of the Doric style, and the ancient Greeks built it slightly out of proportion so that it would appear to be perfect, so it appears perfect because of a calculated imperfection.  The numerous friezes that survive are located both in the Acropolis museum and in the British museum in London. (Still a point of contention between the two nations)  The friezes depict different mythological scenes.  At one point the cache of powder housed within exploded destroying the roof.  It’s a wonder that the Parthenon still stands at all considering what it’s been through.  It’s not the only temple on the acropolis but it surely is the most important.  It’s currently being restored, they are however, not going to try to recreate the roof.  It amazing to see this shining example of classical architecture.