Access to Partenon

A fascinating place. Just the experience of getting in is unforgettable. (The custodian/squatter demanded my cap as part of his end of the bargain -- didn't get it.)
We found the lavishness of the "art" up there outdone only by its crudeness.

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So is the place open to visitors on a daily basis? Like some old dude sitting on a chair guarding the gate, hitting up visitors like the pay toilet @ the Mercado; or is somebody actually conducting a guided tour?
I guess I'd want to check it out for myself too now that i've heard about it and it's in town, like up the hill from where I usually lodge.