This building is one of the world’s greatest architectural achievements. Built as a Byzantine cathedral in 537 AD, it became an Ottoman mosque in the 15th century. Today is neither church nor mosque, but a stunning monument to Istanbul’s colorful history. The original church was designed an “earthly mirror of the heavens” and my image echoes that theme by featuring a mysterious cloudscape that floats over its vast dome. Evening light warms the structure’s colors, particularly the shockingly red façade at its center.