1 Ayasofya

Built 1,500 years ago as an Orthodox Christian cathedral, Hagia Sophia was converted into a mosque after the Ottoman conquest in 1453. In 1934 it became a museum and is now a Unesco World Heritage site. Now it became a mosque again

2 Topkapı Palace

Topkapı Palace was an Ottoman Palace which was built in the late 15th century and which is located in Istanbul, Turkey. It became a museum in 1924. It is one of the biggest Palace-museums in the world. The Palace has a beautiful view of the Bosphorus and it is located in a peninsula.

It is the most visited museum in Turkey. Millions of tourists visit Topkapı Palace every year. Also the palace has been the capital of Ottoman Empire for more than 400 years. After the foundation of Turkish Republic it became a museum.

3 YereBatan (Basilica) Cistern

First constructed by Emperor Constantine, the small building was rebuilt by Emperor The Basilica Cistern was again built in the middle of the 6th century during the reign of Byzantine Emperor Justinian I. It receives its name from a 3rd or 4th century basilica that once stood in its place. The cistern provided water filtration for the Great Palace of Constantinople and also continued to provide water to Topkapi Palace for a short time after the Fall of Constantinople.