Milan is famous for its wealth of historical and modern sights - the Duomo, one of the biggest and grandest Gothic cathedrals in the world, La Scala, one of the best established opera houses in the globe, the Galleria Vittorio Emanuele, an ancient and glamorous arcaded shopping gallery, the Brera art gallery, with some of the finest artistic works in Europe, the Pirelli tower, a majestic example of 1960s modernist Italian architecture, the San Siro, a huge and famed stadium, or the Castello Sforzesco, a grand medieval castle and the UNESCO's World Heritage Site Santa Maria delle Grazie Basilica, containing one of the world's most famous paintings: Leonardo da Vinci's The Last Supper. If you plan to visit it reserve a ticket online, as it is sold out for several months. (Milan Wikitravel)