The Church of Spilt Blood, Saint Petersburg, Russia. Russia is underrated in my opinion for its amazing architecture. Synagogues, Mosque, and Cathedrals have always drawn my attention. The colors and style of this is absolutely stunning.
Blue Mosque or The Sultan Ahmed Mosque is an historic mosque in Istanbul. The mosque is popularly known as the Blue Mosque for the blue tiles adorning the walls of its interior. It was built during the rule of Ahmed I.
The Church of Saint Demetrius is the main sanctuary dedicated to Saint Demetrius, the patron saint of Thessaloniki (in Central Macedonia, Greece), dating from a time when it was the second largest city of the Byzantine Empire.