Constantinople

The Blue Mosque (Sultan Ahmed Mosque) in Istanbul, built between 1609-1616 CE, is one of the most magnificent examples of Ottoman architecture and a masterpiece of Islamic architectural achievement.

The Ottoman Empire ruled for over 600 years, spanning three continents at its height. Founded by Osman I in 1299 CE, it became one of history's most powerful empires, serving as the seat of the Islamic Caliphate from 1517 until 1922.