Since the inter-war years, Polish art and documentary photography has enjoyed worldwide fame and in the 1960s the Polish School of Posters was formed. Throughout the entire country, many national museum and art institutions hold valuable works by famous masters. Major museums in Poland include the National Museum in Warsaw, Poznań, Wrocław, Kraków, and Gdańsk, as well as the Museum of John Paul II Collection, and the Wilanów Museum. Important collections are also held at the Royal Castle in Warsaw, Wawel Castle and in the Palace on the Isle. Contemporary art galleries include Zachęta, Ujazdów, and MOCAK. The most distinguished painting of Poland is ''Lady with an Ermine'' by Leonardo da Vinci, held at the Czartoryski Museum in Kraków. Although not Polish, the work had a strong influence on Polish culture and has been often associated with Polish identity.