The Kapale Martak ( Covered Market ) of Istanbul is the world 's largest covered bazaar , with about 4,000 shops , as well as banks , cafe , restaurants , mosques , and a post office , crammed together in a grid of 66 narrow streets that total 8 km ( 5 miles ) in length all protected from summer sun and winter rain by a multitude of domed and vaulted roofs .
The Kapale Martak has been a famous tourist destination for centuries .