Grand Bazaar, Fatih District (Old City of Istanbul)

The Grand Bazaar (Turkish: Kapalıçarşı, meaning ‘Covered Market’; also Büyük Çarşı, meaning ‘Grand Market’) in Istanbul is one of the largest and oldest covered markets in the world, with 61 covered streets and over 4,000 shops in a total area of 30,700 m2, attracting between 250,000 and 400,000 visitors daily. In 2014, it was listed No.1 among the world's most-visited tourist attractions with 91,250,000 annual visitors. The Grand Bazaar at Istanbul is often regarded as one of the first shopping malls of the world.
Located inside the Walled city of Istanbul, the Grand Bazaar's core started during the winter of 1455/56, shortly after the Ottoman conquest of Constantinople and was part of a broader initiative to stimulate economic prosperity in Istanbul. Its long history is discribed in great detail using the link below:

Source: https://en.wikipedia.org/wiki/Grand_Bazaar,_Istanbul