We went to the viewing terrace of the Sapphire Tower, the current tallest building in Europe... It is quite nice to be able to look at the whole city from that high up. Scale gains a new meaning. You can actually see the main buildings you drive to and from, the two bridges connecting the Asian and the Europian side on the same plane. It is mesmerizing for any age.
The only thing that was not beautiful up there was a realization that this city is filled with a lot of concrete without any taste or planning. Yes, the coastline is amazing with the old palaces, mosques, shipyards, fortresses and there is a lot of beauty in Istanbul, but there is also this:
I have recently seen a trailer for Ekumenopolis, a documentary about the non-existing urban planning in Istanbul. Beautifully done and intimidating.