Hagia Sophia (known as Sancta Sophia in Latin and Ayasofya in Turkish) is one of the oldest historical structures in the world standing for nearly 1500 years. In its long history it has been damaged and rebuilt for several times up to now. Howover, it is still standing as a great sample of architecture today.

It was built as a church when the time of Constantinopole. In 1453 Sultan Mehmet conquered Constantinopole and decided to convert the church into mosque. The Hagia Sophia served as a mosque for about 500 years. And In 1934 it was converted to the Ayasofya Museum. Today many people come to visit there.

You can take an online tour here and see the whole Hagia Sophia structure (your browser may need plugins).