الباب العالي
After the establishment of the Republic of Turkey, Topkapı Palace was transformed into a museum on 3 April 1924. It was also the first museum of the Republic of Turkey. Topkapı Palace Museum covers approximately 400,000 square meters at the present day. Topkapı Palace is separated from the city on the land-side by the Imperial Walls, which were constructed by Mehmed the Conqueror. It is separated from the city on the sea-side by the Byzantine Walls. Topkapı Palace is one of the largest palace-museums with its architectural structures, collections, and approximately 300,000 archive papers.