The difference lies in the fact that in Istanbul the remains of a glorious past civilization are everywhere visible.
No matter how ill-kept, no matter how neglected or hemmed in they are by concrete monstrosities, the great mosques and other monuments of the city, as well as the lesser detritus of empire in every side street and corner—the little arches, fountains, and neighborhood mosques—inflict heartache on all who live among them.
The Centre of the World 