Photo understates the scene...
Tucked away, near The Blue Mosque...
The partial picture on the right of the ticket, must be the normal setting of the interior...
... but on this afternoon, a crew was setting up for a special party or celebration. Pretty much the whole time I was down here, "Hotel California" by the Eagles, was playing over the sound system, making this visit somewhat surreal.
A demo setup (behind plexiglass) off to the side. This 'cistern' seems to serve regular duty as a party spot.
What every cictern needs: A bar.
How old is this marking?