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.
"Al-Masjid al-Nabawi" - Madina, Saudi Arabia. (One of the most important symbols of the Islamic religion. Considered to be the world's second holiest mosque. The final resting place of Prophet Muhammad)