Ruins Telestirion in Municipality of Elefsina

You're standing at the Telesterion in Eleusis, once one of the most sacred spots in all of Greece. This was the great initiation hall of the Eleusinian Mysteries, devoted to the goddess Demeter and her daughter Persephone. Have a look around at the remains of the square hall. Its roof was about fifty-five yards on each side, and thousands of people could gather underneath it.