Istanbul has many fascinating landmarks, among them the Hagia Sofia and the Blue Mosque. The Istanbul Modern Museum, opened in 2004, exhibits both national and international modern artists. The multi-purpose business/shopping complex Kanyon has been noted for its dramatic architecture. Of course, no visit to Istanbul is complete without a trip to a Turkish Bath (Hamam). The city’s Tünel, an underground funicular, is the world’s second-oldest subway line.