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.
Saint Petersburg Mosque, Russia - Quote:"The walls were made with grey granite and the dome and both minarets (tower) are covered with mosaic ceramics of sky-light-blue colour. Skilled craftsmen from Central Asia took part working on the mosque.
The Galata Tower — called Christea Turris by the Genoese — is a medieval stone tower in the Galata/Karaköy quarter of Istanbul, Turkey, just to the north of the Golden Horn's junction with the Bosphorus.