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Aya Sofya(Hagia Sophia) The first church on Constantinople was built by Constantine the Great in AD 326. It is a church-turned mosque-turned museum. It is famous in particular for its gorgeous domes. It is epitome of Byzantine architecture and is said to have change the history of architecture. It is considered that the total cost of building was 360 hundredweight of gold and that about ten thousand workmen were employed in its construction. Hagia Sophia is one of the most visited museums and most prominent monuments in the world.  Hagia Sophia Museum visiting information .  Summer Schedule- 15 APRİL -25 OCTOBER  Visiting Hours:  09.00 - 19.00 Hours of Ticket Sale:  18:00 Winter Schedule- 25 OCTOBER- 15 APRİL  Visiting Hours:  09:00- 17:00 Hours of Ticket Sale:  16:00 Ticket Price:  40 TL Location: Aya sofya avenue, Beyazıt, İstanbul.

Topkapı Palace  After the conquest of Istanbul(Constantinople), the construction of the palace was started in 1460 and it was built on Eastern Roman Acropolis in 1478.  I think that's enough for the history. The Topkapı Palace became UNESCO World Heritage site in 1985.   Today the Topkapı palace is an epic museum. The museum includes many examples of Ottoman arthitecture. There are large amount of porcelain, weapons, swords, diamonds, treasures and jewelry. The palace museum entarence fee is 40 Turkish Liras and The Harem Section fee is 25 Turkish Liras. You can make more info in here http://topkapisarayi.gov.tr/en