Topkapı Palace was built after the conquest of Istanbul by the order of Fatih The Conqueror in 1478 AD. The palace was used as Sultans major residence and it had been used for Ottoman rule for 380 years. Now, Topkapi Palace is one of the most popular tourist destination in Istanbul. Topkapı Palace takes space 80.000 square meters approximately. When you visit to Topkapı Palace Museum, you should see the Tower of Justice, Divan, Harem and Imperial Hall.