Selfridges, London

At 10 acres, Selfridges‘ Oxford Street flagship store is the second-largest shop in England (beat for the top spot by Harrods) and has the stock to show for it. Be sure to check out the famous window displays, which have been photographed and featured in magazines including Vogue and Dwell, and take a break from endless shopping to check out the Art Deco main entrance and in-store art exhibitions.