Topkapi Palace, the imperial residence of the Ottoman Sultan, his court and Harem, was also the center of the state administration. The Topkapi Palace was the Ottomans’ second palace in Istanbul. Its construction was completed in 1478. As each succeeding sultan ascended to the throne, he added parts to the palace, indicating to us the different tastes and styles of architecture of four centuries. The Topkapi Palace housed each of the Ottoman Sultans from Sultan Mehmed II to Sultan Abdülmecid, covering nearly four centuries and 25 Sultans. In 1924 the palace was turned into a museum.