This article was automatically translated from the original Turkish version.
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Hagia Sophia History and Experience Museum is a center located on Istanbul's historic peninsula, right next to Sultanahmet Square, place covering an area that sheds light on the city's 1700 year history important through culture its exhibits. Opened on 22 July 2023, museum uses the latest technological methods to convey to visitors the journey of Hagia Sophia through the Byzantine, Ottoman and Republican periods. The museum operates in the historical Defter-i Hakani Nezareti building. This building, designed by Vedat Tek between 1907 and 1908 and completed in 1910, is one of the most important examples of the First National Architecture movement. During the Ottoman period it served as a government office for official record keeping and later came under the ownership of the Directorate of Land Registry and Cadastre during the Republican era. Following comprehensive restoration work that began in 2020, the building was transformed into a museum narrating the history of Hagia Sophia.
Hagia Sophia was converted into a mosque in 1453 following Ottoman Empire's conquest of Istanbul. The Ottoman sultan Fatih Sultan Mehmet transformed Hagia Sophia into a mosque to strengthen the city's Islamic identity. Christian figures, mosaics and frescoes within the structure were covered or plastered over to conform to Islamic cultural norms. Hagia Sophia continued to function as a mosque throughout the Ottoman period, during which several additions were made. In particular, Mimar Sinan carried out repairs and renovations to preserve the building's grandeur.
During the Ottoman Empire, Hagia Sophia acquired significance not only as a place of worship but also as a cultural and religious symbol importance. For centuries, it served as a mosque and remained one of the most important mosques in Istanbul until the end of the Ottoman Empire.
Following the proclamation of the Republic, the status of Hagia Sophia was reevaluated in the early years of the Turkish Republic. In 1934, under the directive of President Mustafa Kemal Atatürk, Hagia Sophia was opened as a museum as part of a broader effort to secularize many religious buildings in Türkiye. After its opening as a museum, many elements associated with its function as a mosque were cleaned during restoration works, and the Christian-era mosaics were once again revealed. These restorations enabled Hagia Sophia to become a unique structure presenting both its Christian and Islamic heritage side by side.
From 1935 onwards, Hagia Sophia as a museum attracted visitors from around the world and became one of Istanbul's most important tourist and cultural centers. The museum presented the fusion of Christian and Islamic cultural elements to its visitors. In this unique structure, Ottoman-era decorations, carpet and inscriptions could be seen alongside Byzantine mosaics and frescoes.
In 2020, Hagia Sophia was reconverted into a mosque by decree signed by Türkiye's President Recep Tayyip Erdoğan. This decision generated widespread echo both nationally and internationally, and elicited varied responses world across the globe. The decision to resume worship in Hagia Sophia has been closely associated with the transformation of the religious atmosphere in Türkiye. Although prayer has resumed in Hagia Sophia as a mosque, its role as a like site continues to be significant both as a mosque and as a historical and cultural heritage site.
In addition to being one of Istanbul's most important symbols, Hagia Sophia has made significant contributions to world history. It held major religious, cultural and social importance during both the Byzantine and Ottoman periods. The presence of elements from both Christian and Islamic cultures in Hagia Sophia has transformed it from merely a place of worship into a vital part of the world's cultural heritage.
Hagia Sophia continues to hold significance as a structure embodying both religious and cultural identity for the Turkish people. As one of the rare places where Christianity and Islam have coexisted, Hagia Sophia symbolizes the possibility of different faiths and cultures living together. It is also recognized globally as a art and architectural marvel.

Exhibited Artifacts (Source: Dergi Park)
The museum building features an impressive design that blends Neo-Classical and Ottoman architectural elements. The most prominent feature on the façade is the inscription above the main entrance: "Defter-i Hakani Nezareti, Ketebe Hüseyin 1326". Additionally, the signature of architect Vedat Tek is located in the upper corner of the entrance. The structure consists of 13 halls spread across an area of 3,200 square meters. On the ground floor, a Byzantine-era cistern uncovered during restoration is displayed. The building's three floors are organized chronologically, offering visitors a journey through different historical periods.
The museum's collections consist of rare artifacts from different periods of Hagia Sophia's history. On the third floor, artifacts from the Byzantine period are exhibited. This section includes bronze coins from the reign of Constantine I, a gold coin of Emperor Theodosius II, and various architectural fragments from the reign of Emperor Justinian I. Additionally, replicas of some artifacts looted during the Crusades are displayed in this section. The second floor is dedicated to the Ottoman period. Here, visitors can find coins issued by Fatih Sultan Mehmed, documents from the Hagia Sophia Mosque Foundation, and information regarding the additions made by Mimar Sinan. On the first floor, documents from the Republican period and artifacts from the time when Hagia Sophia served as a museum are exhibited.

Exhibited Artifacts (Source: Dergi Park)

Exhibited Artifacts (Source: Dergi Park)
The museum goes beyond traditional museum practices by offering interactive experiences to visitors. On the third floor, the installation titled "Mirrors of Infinity" reflects the architectural grandeur of Hagia Sophia. The museum also features audio guide systems available in 15 languages. In the experience zones, special music and projection displays recreate the atmosphere of different historical periods. One of the museum's most striking features is the 12,000-pixel portrait of Mimar Sinan created using on mapping technology. This portrait narrates the restoration efforts carried out during the Ottoman period.
The museum is open seven days a week. During the Summer season (1 April - 1 October) it operates from 09:00 to 20:00, and during the winter season (1 October - 1 April) from 09:00 to 18:30. Admission is free for holders of the Museum Pass. Special arrangements are available for visitors with disabilities. The café on the first floor provides visitors with a place to rest, while the museum shop offers souvenirs specifically related to Hagia Sophia.
The Hagia Sophia History and Experience Museum is an important center established to preserve Istanbul's cultural memory and transmit it to future generations. The museum does not merely display historical artifacts; it enhances the accessibility and appeal of history by offering interactive experiences to visitors. By narrating the 1700-year history of Hagia Sophia in the finest detail, the museum makes a significant contribution to Istanbul's cultural heritage. Located in the historic Sultanahmet Square, the museum is an indispensable destination for both domestic and foreign tourists.

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Historical Significance and Location of the Museum
Transformation of Hagia Sophia During the Ottoman Period
Conversion of Hagia Sophia into a Museum (1935)
Reconversion into a Mosque in 2020
Cultural and Religious Significance of Hagia Sophia
Architectural Structure and Physical Features
Collections and Exhibition Halls
Technological Innovations and Experience Zones
Visitor Experience and Practical Information
The Museum's Contribution to Cultural Heritage