This Powerpoint slideshow presentation shows the amzaning 1500 years old building that is still standing today. Together with the Panteon in Rome, they are the two most important historical buildings in the history of European architecture today that are still in use. The building was started as a Christian church in the city of Constantinople, as the Christian rival church in the New Rome of the East. In 1453, the city fell to the Turks. It became a mosque and inspired many to follow its architectural style. Today, it is a museum.