The Underground Cistern is located near the Saint Sophia
Church in the Sultan Ahmet district. The Turks call it "Yerenbatan Sarayi"
which means "underground palace".
The cistern is supported by 336 beautiful beautiful columns
two of which are carved with the head of Medusa on the plinth.
While inside, you can enjoy classical background music, the differently illumuinated coloumns and watch fishes swimming in the water.
And at the end of the tour you can also throw a coin and make a wish ...