Look up the word ‘cistern’ in the dictionary and you’ll see that it means ‘tank’. And that’s what the Basilica Cistern is — one huge water tank. The difference? It is one ANCIENT water tank, constructed in 532 A.D. primarily to supply water to the Byzantine Palace. Later on, it supplied water to Topkapi Palace and other buildings.
The Basilica Cistern, also known as the “Sunken Palace” or Yerebatan Sarayi in Turkish, is a cathedral-sized underground chamber, measuring approximately 138 metres (453 ft) by 64.6 metres (212 ft) – about 9,800 square metres (105,000 sq ft) in area – capable of holding 80,000 cubic metres (2,800,000 cu ft) of water.
The entrance is small, almost like a guard house, and can easily be missed if not for the crowd queueing up outside.
Walk down the stone staircase and suddenly you find yourself plunged into darkness. As your eyes start to adjust to the dim lighting, you can make out row after row after row of stone columns.
The water in the Basilica Cistern comes from the Eğrikapı Water Distribution Center in the Belgrade Forest which is 19 kilometres(!) from the city. It is yet another example of an engineering feat from ancient times. Today, there is still water inside but water levels are now low. Numerous fish can be seen swimming about in the water, probably placed there to avoid mosquitoes from breeding. That’s just my theory actually. I don’t even know if mosquitoes exist in Turkey because I didn’t encounter any the whole time I was there.
Water still drips through the brick-domed ceiling in some places, making it quite slippery — so watch your step! — and a bit of a danger for your photography gear.
There are platforms now for tourists to walk on but not too long ago, tourists needed to explore this place in small boats! What an experience that would have been!
The biggest attraction inside the Basilica Cistern are the two Medusa heads which now serve as the bases for two columns in towards the rear. No one knows how they got there or why they are there. And what makes them even more intriguing is how they are positioned — one Medusa head is lying down on its side…
…the other Medusa head is upside down.
Here is a short video that I shot of the upside down Medusa head using my trusty old Nokia N82, just to give you a sense of scale of the Medusa head, as well as give you taste of the ambience of the Basilica Cistern:-
The entire cistern’s dim orangeish lighting and the echoing sound of the water dripping melancholically from the ceiling in some places give an eerie, other-worldly, almost Greek mythology-like feeling to the Basilica Cistern. I strongly advise against the use of flash when using your camera down there if you wish to capture the ambience of the place in your photos.
The only modern ‘anomaly’ inside the ancient structure is a cafe just before the exit.
The Basilica Cistern is just a stone’s throw from Hagia Sophia (Ayasofya) and is open every day from 09:00 hrs to 18:30. The entrance fee is 10 Turkish Lira (~7 USD) for foreign visitors. Allocate some 30 minutes for your visit.





































