Hagia Sophia, officially the Hagia Sophia Grand Mosque, is a mosque and a major cultural and historical site in Istanbul, Turkey. It was formerly a church (360–1453) and a museum (1935–2020). The last of three church buildings to be successively erected on the site by the Eastern Roman Empire, it was completed in AD 537, becoming the world's largest interior space and among the first to employ a fully pendentive dome. It is considered the epitome of Byzantine architecture and is said to have "changed the history of architecture".From its dedication in 360 until 1453 Hagia Sophia served as the cathedral of Constantinople in the Byzantine liturgical tradition, except for the period 1204–1261 when the Latin Crusaders installed their own hierarchy.After the fall of Constantinople in 1453, it served as a mosque, having its minarets added soon after. The site became a museum in 1935, and was redesignated as a mosque in 2020.

Officially the Sultan Ahmed Mosque , is an Ottoman-era historical imperial mosque located in Istanbul, Turkey. It was constructed between 1609 and 1617 during the rule of Ahmed I. It attracts a large number of tourists and is one of the most iconic and popular monuments of Ottoman.

The Hippodrome of Constantinople was a circus that was the sporting and social centre of Constantinople, capital of the Byzantine Empire. Today it is a square in Istanbul, Turkey, known as Sultanahmet Square.

The Topkapı Palace or the Seraglio,is a large museum and library in the east of the Fatih district of Istanbul in Turkey. From the 1460s to the completion of Dolmabahçe Palace in 1856, it served as the administrative center of the Ottoman Empire, and was the main residence of its sultans.

The Grand Bazaar is meaning ‘Grand Market' in Istanbul is one of the largest and oldest covered markets in the world, with 61 covered streets and over 4,000 shops on a total area of 30,700 m2, attracting between 250,000 and 400,000 visitors daily. In 2014, it was listed No.1 among the world's most-visited tourist attractions with 91,250,000 annual visitors.The Grand Bazaar at Istanbul is often regarded as one of the first shopping malls of the world.