Yerebatan Palace (Cistern)
It was built by Emperor Constantinus I during the 4th century and was restored and extended by Justinianus in the 6th century. The water came from the Belgrad forest via the Cebecikoy arch. It is 141 m long and 73 m wide. It has 336 pillars 5 m apart and 8 m high.
Yedikule Hisarı
Yedikule hisari or shortly Yedikule, being one of important architectural arts of Istanbul is on the south of city land water and under authority of Directorate of Hisarlar Museum in the same town.
Turkish and Islamic Arts Museum
Turkish and Islamic Works Museum is the first Turkish museum covering the Turkish and Islamic art works wholly. The establishment works that have been started at the end of 19th century have been completed in 1913 and the museum has been opened for visit in the soup kitchen building located in Suleymaniye Mosque complex, which is one of the most important works of Mimar Sinan, with the name of “Evkaf – i Islamiyet Muzesi” (Islamic Foundations Museum). After the announcement of the republic, it has taken the name “Turkish and Islamic Works Museum”.
Towers
Galata Tower: The tower was built by the Genoese in 1348, during their occupation of the area, primarily to prevent attacks. Originally known as the Tower of Christ, it stood above the fortification surrounding the Genoese city-state. There is a spiral rock staircase which ascends to the top viewing platform, which today offers visitors spectacular 360 degree panorama of the entire city. The tower was restored in 1967, and an elevator was installed to offer a less tiring alternative to the steep climb. There is also a restaurant on the top floor.
Topkapı Palace Museum
It is located on the promontory of the historical peninsula in Istanbul which overlooks both the Marmara Sea and the Bosphorus. The walls enclosing the palace grounds, the main gate on the land side and the first buildings were constructed during the time of Fatih Sultan Mehmet (the Conqueror) (1451 – 81). The palace has taken its present layout with the addition of new structures in the later centuries. Topkapi Palace was the official residence of the Ottoman Sultans, starting with Fatih Sultan Mehmet until 1856, when Abdulmecid moved to the Dolmabahce palace, functioned as the administrative center of the state. The Enderun section also gained importance as a school.