Galata Kulesi
Galata Tower in Istanbul is part of some fortifications built in old times in the neighborhood known as Galata to protect the area. Although the builder of the tower remains unknown, one myth says that is was built as a lighthouse tower in 507 by the Byzantine Empire. One other account says that it was built or restored by Genoese who conquered the region in 1216. However, it is known that the Genoese, who got almost into the city of Istanbul in 1348, transformed the tower into a castle with wide walls.

Topkapı Sarayı
Built after the conquest of Istanbul between 1460 - 1478 by Conqueror Mehmet II and expanded in tile with some outbuildings, Topkapı Palace has been the administrative center of the empire and the residence of sultans for about 380 years. Left after the construction of Dolmabahçe Palace, the Palace has always maintained its significance. It is common knowledge that some parts of the Palace were opened to public by special permission during the reigns of Sultan Abdülmecit I and Sultan Abdülaziz.

Hagia Sophia
The word “sophia” in the structure’s name is not the name of any person, comes from the word sophos meaning “wisdom” in ancient Greek.[4] Therefore the name “hagia sophia” means “holy wisdom” or "divine wisdom”, and is considered as one of the three qualifications of God in Orthodoxy. This is a basilica-planned patriarchal cathedral built by Byzantine Empire Justinian I between 532 - 537 AD at the old city center in the peninsula of Istanbul, transformed into a church by Mehmet the Conqueror upon conquest of Istanbul by the Turks in 1453 and has been serving as a museum since then.