Ottoman architecture is the architecture of the Ottoman Empire which emerged in Bursa and Edirne in 14th and 15th centuries. The architecture of the empire developed from the earlier Seljuk architecture and was influenced by the Byzantine architecture, Iranian as well as Islamic Mamluk traditions after the conquest of Constantinople by the Ottomans. For almost 400 years Byzantine architectural artifacts such as the church of Hagia Sophia served as models for many of the Ottoman mosques. Overall, Ottoman architecture has been described as Byzantine architecture synthesized with architectural traditions of the Mediterranean and the Middle East.The Ottomans achieved the highest level architecture in their lands hence or since. They mastered the technique of building vast inner spaces confined by seemingly weightless yet massive domes, and achieving perfect harmony between inner and outer spaces, as well as articulated light and shadow. Islamic religious architecture which until then consisted of simple buildings with extensive decorations, was transformed by the Ottomans through a dynamic architectural vocabulary of vaults, domes, semi domes and columns. The mosque was transformed from being a cramped and dark chamber with arabesque-covered walls into a sanctuary of aesthetic and technical balance, refined elegance and a hint of heavenly transcendence.Today, one finds remnants of Ottoman architecture in certain parts of its former territories under decay.