Ankara Treaty of Lausanne (1923), the Turkish nationalists replaced the Ottoman Empire with the Republic of Turkey on 29 October 1923. A few days earlier, Ankara had officially replaced Constantinople as the new Turkish capital city, on 13 October 1923. After Ankara became the capital of the newly founded Republic of Turkey, new development divided the city into an old section, called "Ulus", and a new section, called "Yenişehir". Ancient buildings reflecting Roman, Byzantine, and Ottoman history and narrow winding streets mark the old section. The new section, now centered on Kızılay Square, has the trappings of a more modern city:
Ankara particularly famous for its Kalecik Karası and Muscat grapes; and its Kavaklıdere wine, which is produced in the Kavaklıdere neighbourhood within the Çankaya district of the city. Ankara is also famous for its pears. Another renowned natural product of Ankara is its indigenous type of honey ("Ankara Balı") which is known for its light color and is mostly produced by the Atatürk Forest Farm and Zoo in the Gazi district, and by other facilities in the Elmadağ, Çubuk and Beypazarı districts. Ankara is the center of the state-owned and private Turkish defence and aerospace companies, where the industrial plants and