Just a block from my hotel, which was located in Madrid's Salamanca district, was the luxurious Calle Serrano. Here, you'll find anything and everything in the way of shopping. From the trendy shopping "mall" ABC Shopping, to tons of high end boutiques like Louis Vuitton and Cartier, to department stores like Spain's own El Corte Ingles. The ABC Shopping Center in particular was right next to my hotel and provided a nice indoor escape when the weather on my second day turned bad and I needed to stay dry. If shopping is atop your list of travel activities, make sure to visit Calle Serrano.