Historical, but very dark and not a lot to see. Fun photography set up with costumes when you first go in.

Underground cistern to supply water to the Bascilica. 300+ Roman columns. Fish in what water is there. The columns are all different and worth looking at. Lots of people, but you could walk around without too much trouble. Well worth the visit.

It is near the Hagia Sophia and was used for scenes in a Jmaes Bond movie. You can't row a boat out into the middle anymore but you can see the two Medusa stone heads used to shore up two recycled pillars. A nice cool spot on a hot day!

soo different and lovely...we were expecting nothing and were charmed by this special place..sooo unique...worth the time and money

From the outside, this is a very unassuming building. Looks like it could be a small post office. However, underground is one of the most beautiful spaces I've ever seen.You will be in awe of how this was ever created. There was no line (2 hour wait at its neighbor, Hagia Sofia).

Truly awe inspiring place - an absolute must if visiting Istanbul. The sheer scale of this 1500 year old cistern is unbelieveable.

I recommend you to visit this place and make a wish: put your finger in special hole, make a wish and turn your hand 180 degree...

This is a beautifully restored building which has been lit to perfection showing off the beautiful underground water "palace" a really worthwhile visit with the added bonus of the two large Medusa heads

For 10 Liras a person, there's nothing to see in there, except for Medusa. The place is made to look special with added lighting effects, but there really is very little to see or take in. I'd save that money for some yummy street food.