Temple of Olympian Zeus
One of the most important religious sites in ancient Athens was the Temple of Athena, known today as the Parthenon, which stood on top of the Acropolis, where its evocative ruins still stand. Two other major religious sites, the Temple of Hephaestus (which is still largely intact) and the Temple of Olympian Zeus or Olympeion (once the largest temple in mainland Greece but now in ruins) also lay within the city walls.