Damascus, Syria's AL-HAMIDIYAH SOUQ has been in operation since the seventh century. This weather-protected bazaar extends for 1,300 feet.
Photo from Wikipedia / "Bernard Gagnon"

A 19th century rendering of St. Petersburg's GOSTINY DVOR. The commercial complex, dedicated August 19, 1785, took 28 years to complete. In its original state, it encompassed 570,000 square feet and housed 100 shoppes. Today, it is one of The Continent's most upscale shopping venues.
Drawing from Wikipedia / "Ghirlandajo"