Madrid's more modern and avant-garde areas are the two avenues in the new urban expansion area –the Gran Vía and Paseo de la Castellana. The Gran Vía, which was built at the beginning of the 20th century, is a place for shopping, leisure and hotels. The Paseo de La Castellana crosses the city from north to south, and has some of the most elegant hotels in the city, as well as corporate offices in modern and avant-garde buildings. And although Madrid is home to a truly outstanding architectural heritage, there is no question that its greatest artistic wealth is to be found in its art galleries.