We started our private tour of Istanbul - all four of us in a minivan, with a driver and guide - at the Hippodrome of Constantinople looking at the obelisks brought there by sea (including one whose bottom half was sunk during the crossing, leaving us with half-an-obelisk now). Next we moved to the "Blue Mosque" (Sultan Ahmet) where we wandered inside and saw how the profusion of blue tiles helped this mosque to become known by its blue color.
This was followed by a stop at the Pudding Shop , the underground cistern (not the one in the link, but similar). The cistern had been emptied in order that walkways might be built a decade or so ago. When empty, two Medusa heads were revealed as part of the scavenged materials used to build the cistern. We then moved on to the Covered Bazaar where we did some shopping (t-shirts, jewelry and amusement were the order of the day).
We ended our tour with a ride up the Bosporus to see Robert College , where my father taught when he was a student while his father was stationed in Turkey (he taught physics labs in exchange for room and board in a student dormitory).