The library of Celsus is an ancient Roman building in Ephesus, Anatolia, now part of Selçuk, Turkey. It was built in honour of the Roman Senator Tiberius Julius Celsus Polemaeanus by Celsus' son, Gaius Julius Aquila.
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.