Only the palace is the part of the tour which has so much to see and to be said. A guided tour is a must to really understand the meaning of the most popular attractions of Istanbul. In short, the Topkapi Palace was the imperial residence of the Ottoman Sultans, from Fatih Sultan Mehmet, the Conqueror, until 1856. It became a museum in 1924. Parts of the palace and the Harem, Baghdad Pavilion in Hall Revan, Sofa Pavilion, and the courtroom are distinguished by its architectural heritage, while in other sections artifacts are displayed which reflect the palace life. The museum also has collections from the imperial treasury including Chinese porcelain, weapons, calligraphy etc. It is closed on Tuesday.