Rosina C's Istanbul, Turkey
This is one you must see, although there are SO MANy gorgeous mosques, do not focus just on this one...
Alemdar Mahallesi, Yerebatan Caddesi, No:1/3
incredible site to see and worth it, no doubt. This is real history that should not be missed
Sinan Aga Mah. Zeyrek Cad. No:4
worth it with great history, great mosaics and a true wonder
Hagia Sophia Museum / Church (Ayasofya)
Ayasofya Square, Sultanahmet
This is so historic, once a church, then a mosque, now a museum.