Meaning Divine Wisdom, Hagia Sophia was the largest building on earth barring the Egyptian Pyramids or the Great Wall of China. Today's Hagia Sophia was built by Emperor Justinian in 537AD. It was the religious center of the city during the Byzantine period. It was used as a church for 916 years and as a mosque for 481 years, In 1934, by the order of Mustafa Kemal Ataturk, it was converted into a museum and has since been open to visitors

As well as being the imperial residence of the Sultan, the palace was also the seat of government for the ottoman empire. It housed the Ottoman sultans for nearly 400 years until the Dolmabahçe palace was built. In 1924 it was converted into a museum. Today it is famous with a harem, royal treasury, and holy relics sections.

is the size of a cathedral; it is 143m long and 65m wide and can hold up to 80,000 cubic meters (or 17.5 million gallons) of water. There are 336 giant columns (mostly Ionic or Corinthian in style) supporting the structure in 12 rows of 28 columns.

Built by the Ottoman Sultan Ahmet I in the year 1616, it is located opposite the Hagia Sophia. Blue mosque today is one of the most famous landmarks of the old city with its famous six minarets and magnificent dome. Although it is officially named Sultanahmet Mosque, the (nıck) name Blue Mosque was given to it by the visitors because of the amazing blue tiles decorating the interior walls.

Built by the Roman Emperor Septimus Severus in 203AD, during the Roman period hippodrome was the civil center for the people of the city where once 100,000 spectators could be held. Located in the heart of Sultanahmet surrounded by Blue mosque, Hagia Sophia, and Topkapi Palace, today it is home to The Egyptian Obelisk (Dikilitaş), The Serpentine Column(Burma sütun), The Constantine Column, and German Fountain.