Introduction Istanbul is one of the most fascinating cities in the world, creating a link between two continents, Asia and Europe. It has rich history which is intertwined with culture and ethnic orientation of most of its famous and influential conquerors. Part of what enriches Istanbul’s culture is Ayasofya building which holds unbeaten ancient architectural standings and value. Ayasofya is arguably one of the most important and significant buildings in history. Referred to as Hagia Sophia in Greek, the building has gone through several functional transitions, serving as a church, a mosque and currently as a museum in Istanbul. This essay gives a detailed analysis of the building, cutting across its background information, history, physical characteristics and experts’. Background information Ayasofya is located in Istanbul, Turkey and it formerly served as an Orthodox Patriarchal Basilica, then a mosque before it was converted into a museum, a function it served today. From the time of its dedication in 360 until 1453, Ayasofya served as a Greek Cathedral with an exception of the period between 1261 and 1453 when it was used as a Roman Catholic Cathedral under the umbrella of Latin Patriarch of Constantinople (Wegner, 2000). After this period, the building was used as a worship house for the Muslims from May 1453 to the year 1931 when Ayasofya was secularized and ceased being a worship building for any group in Turkey. The building was converted into a museum in 1935, a function which it serves in the 21 st century. This museum conversion was an order given Ataturk, Turkish President. As A result, the building became one of the most significant monuments in Turkey and around the world, priding on its historic richness and architecture that outshines countless renowned centers. According to historic findings, Ayasofya was bestowed to the Logos, who is considered as the second individual as defined by the Holy Trinity in Christianity. This dedication ceremony was held on the twenty fifth day of the month of December after its completion. This date was primarily considered in remembrance of the origin of manifestation of the Logos through Christ (Hagia-Sophia.net, 2008). It is important to mention that its original name defined its divine purpose as it was to serve as the Church of God’s pure wisdom. The building was famously known around the world for its dome that gave rise to Byzantine architecture. With its magnificent architectural finish and design, Ayasofya remained the largest cathedral around the world for close to one thousand years when the construction of Seville Cathedral was completed in the 1520. The construction of the building lasted for two years between 532 and 537 and was a decree from Byzantine Emperor Justinian. Importantly, Ayasofya was erected at the site as the third church after the preceding two buildings were brought down by rioters (Wegner, 2000). Ayasofya as a Church As mentioned in the previous segment, Ayasofya was constructed after two other churches preceding it had been demolished by rioters in Istanbul. Due to the previous incidents, Emperor Justinian I chose to build a majestic church beyond the standards of the previous basilicas (Hagia-Sophia.net, 2008). To achieve this historic dream, the emperor contracted the best architects in Turkey to put up a building that was to remain historic throughout his reign and several years later. Isidore of Miletus