Noun
anaktoron (plural anaktora)
(historical, Ancient Greece) A palace that only hierophants were permitted to enter as part of the Eleusinian Mysteries.
Synonym: telesterion
Then on 20th and 21st Boedromion, the initiates entered a great hall called Telesterion ; in the center stood the Anaktoron ("palace"), which only the hierophants could enter, where sacred objects were stored. Source: Internet