It's a bugger! A huge cistern to supply the sultan's palace with water. In fact, the legacy of the Roman Empire: water flowed through an aqueduct from springs 25 km away, then Archimedes' wheel rose to the palace.
The scale of the tank is amazing! I advise you to definitely visit
A cool place in hot weather. There is a toilet. Very interesting lighting for photos. Informative and fresh. 20-30 minutes will be enough for the head.
There is always a long queue at the tank, but as a rule it's all for electronic tickets, and if you buy a ticket inside, there is almost no queue. When buying tickets, I must say that you need an audio guide, so it's more interesting to walk around it. There is no laser show here.