This is Cité Metro Station in the Ile de la Cité area of Paris. The parisian metro is by no means the best underground system in the world, but in terms of culture, it oozes with nostalgia of the days of old.
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.