Two months ago we spent 2 nights in Istanbul so I could see some big domes. I looked around two.  I need a month to see some more

But there was numberous other interesting stuff to see if you are interested .  Here I post some masonry that might not normally be posted.  The precision on this butress of the AgaSophia is impressive.

This is on some unnamed wall we walked by.

Many streets are paved with these stones.  I even saw people repairing some sections.

Riding around the bus we would fly by interesting looking stuff.  This one seems to have a living roof.

The Wall around the old city is huge, with lots of arches and great stone work.

Another that seems is habited.