Grand Opening: 1461.
The Grand Bazaar in Istanbul is still going strong after 500+ years in the retail business. No Eddie Bauer, indoor water parks, Outback Steakhouses, Spencer Gifts or the Gap, its more than 4,000 stalls/shops within a labyrinth of more than 58 streets overstimulates and enthralls.
Yes, there are carpets. And everything else. The challenge is to not buy at the first shop, and after looking through a number of stalls, remember how to get back to the shop with the best product and price.