Aya Sophia is very important place for Christians and Isramics. This sanctuary is builded as Christian cathedral in 360 by Constantius II. However when The Fall of Constantinople, this cathedral have been falled in to the Isramics hands. Now the building is used as museum. When I visit there that is in June 2015, some places was under renovations but viewing was very solemnity, and I could feel heavy history. There are some icons is left by Christians and Isramic ornaments. That fusion of two biggest religions is simmbol of Istanbul as city of between of two worlds Europe and Asia.