A beautiful view of The Topkapı Palace in Istanbul (Turkey).

Wiki says:
The Topkapı Palace is a palace in Istanbul, Turkey, which was the official and primary residence in the city of the Ottoman Sultans for approximately 400 years (1465-1856) of their 624-year reign.
The palace was a setting for state occasions and royal entertainments and is a major tourist attraction today, containing the most holy relics of the Muslim world such as the Prophet Muhammed's cloak and sword.
Initial construction began in 1459, ordered by Sultan Mehmed II, the conqueror of Byzantine Constantinople. The palace is a complex made up of four main courtyards and many smaller buildings. At the height of its existence as a royal residence, the palace was home to as many as 4,000 people, formerly covering a larger area with a long shoreline. The complex has been expanded over the centuries, with many renovations such as after the 1509 earthquake and 1665 fire. It held mosques, a hospital, bakeries, and a mint. The name directly translates as "Cannon gate Palace", from the palace being named after a nearby gate, which has since been destroyed.
Topkapı Palace gradually lost its importance at the end of the 17th century, as the Sultans preferred to spend more time in their new palaces along the Bosporus. In 1856, Sultan Abdül Mecid I decided to move the court to the newly built Dolmabahçe Palace, the first European-style palace in the city. Some functions, such as the imperial treasury, the library, mosque and mint, were retained though.
After the end of the Ottoman Empire in 1921, Topkapı Palace was transformed by government decree on April 3, 1924 into a museum of the imperial era. The palace complex is full of examples of Ottoman architecture and also contains large collections of porcelain, robes, weapons, shields, armor, Ottoman miniatures, Islamic calligraphic manuscripts and murals, as well as a display of Ottoman treasure and jewelry.