This is the Basilica Cistern, just a few steps away from the Hagia Sofia. Emperor Justinian had this place built in 532 to meet the increasing water needs of the growing city. It is a fantastic place. I visited it twice.  You walk around on elevated walkways amidst dimly lit columns. They play soft, moody, oud music, which blends in with the dripping of water.

Tucked back in the corner, two columns are supported on Medusa head bases. These are most likely plunder from  earlier monuments.

Do not park illegally in Istanbul. They have squadrons of these crane trucks that wll show up within 3 nanoseconds of any parking infraction, squawk in loud Turkish for 30 seconds and then "whoosh!" off goes your car to fates too horrible to contemplate.

The shipping lanes of the Sea of Marmara.

The Golden Horn.

Copyright Estate of Anthony Vail Sloan 2009