Bayezid Mosque, located in the Beyazęt Square, in the neighborhood of the Grand Bazaar. It was built by Sultan Bayezid II, son of the conqeror, second largest mosque erected after the Conquest. The mosque is of inverted T-shaped plan and of considerable historical and architectural significance as it marks the end of its specific pland at the same time the begining of a chain of large size Ottoman Classics Mosques.
Beside the mosque there is an interesting Old Books Bazaar.
Suleymaniye Mosque is the largest mosque in Istanbul and one of the best-known sights in the city. It was built between 1550-1557AD during the reign of Sultan Suleyman I, The Magnificent, who ordered the great architect of Ottoman empire, Koca Mimar Sinan Aga,(April 15,1489-July 17,1588) to built a mosque appropriate to his title, whereupon the construction of the present mosque was begun on third of the seven hills.You will enjoy a comanding view of the Golden Horn. The visitors can visit at any time of the day outside prayers hours.
Marcian's Column (Kiz Tasi) built by Flavius Marcianus (396457) who was the emperor of the Eastern Roman Empire, and Marcian is considered one of the best of the early Eastern Roman emperors.
Fatih Mosque, an Ottoman imperial mosque named after Fatih Sultan Mehmed, the Conqueror, 1453. It is located in the Fatih district on the fourth hill. It is a significant mosque as it represents one of the largest examples of early Ottoman imperial mosques in that an important stage in the development of classic Ottoman Mosques.
Chora Museum is located very close to the main city walls on a hill over looking the Golden Horn. The mosaics and frescoes found here are world famous pieces of classic art which reflect the magnificent heritage of Byzantine Empire.
Be warned: closed on Wednesdays
Roman Walls, the fourth defensive stone walls that have surrounded and protected the city of Constantinople. The first was built by Constantine the Great. As the city expanded the walls moved further out leaving first, second and the third walls within the city, and finally last wall where it is it is today. Over the centuries numerous additions and modifications have been made. It is commonly agreed that the walls are one of the most complex and elaborate systems ever built in antiquity. Constantinople relied on the protection of the walls against attacks from both sea and land, without the walls the city would not have lived that long..