Beaubourg and Les Halles are Paris's most thriving public areas, with millions of tourists, shoppers and students flowing between them. Young people flock to Les Halles, shopping for the lattest street fashions beneath the concrete and glass bubbles of the underground arcades. All roads from Les Halles appear to lead to the Pompidou centre, an avant-garde assembly of pipes, ducts and cables housing the Musée National d'Art Moderne. The smaller streets around the centre are full of art galleries housed in crooked gabled buildings.