Visiting Elevsis

If you go to Greece, studying their ancient religious traditions, Elevsis (Elefsina), ca. 30 km outside Athens, is surely a place you ought to see.
Being one of the most famous sites of the ancient mystery cults, it has a history going back to ca 700 BCE. But to have a good understanding of the site, you need to know the story behind it, that is, the story of Demeter and Kore. You can read about the legend here:

Part of the great hall were family and friends were on-lookers to the rituals of initiation their friends were undergoing. The room shall have been able to keep ca 3000 persons. We can still see the seats on two of the sides, but not much is left of the rest of this location.