World War II, usually held on 1 September. They are generally attended by high-ranking Polish politicians such as Prime Minister Donald Tusk (2014), President Bronisław Komorowski (2015), President Andrzej Duda (2016), and Prime Minister Beata Szydło (2017). The commemoration of the 70th anniversary of the outbreak of World War II, in 2009, was attended by Tusk, former Prime Minister Tadeusz Mazowiecki, and former Presidents Lech Wałęsa and Aleksander Kwaśniewski, as well as by important figures from about 20 other countries, including German Chancellor Angela Merkel, Russian Prime Minister Vladimir Putin, Ukrainian Prime Minister Yulia Tymoshenko, and French Prime Minister François Fillon. The Battle of Westerplatte has been the subject of two Polish films: Westerplatte (1967), and Tajemnica Westerplatte'' (The Secret of Westerplatte, 2013). It has also inspired dozens of books and scores of press articles, scholarly studies, and fictional works, as well as poems, songs, paintings, and other works of art. Tourist attraction The Polish 75 mm field gun became one of Germany's first war trophies of World War II, displayed on a column at Flensburg. After the war, it was moved to stand before the Naval Academy Mürwik. Westerplatte's Guardhouses I, III and IV, the power plant, and the barracks survived the war. In 1946, a and a Tomb of the Unknown Soldier were established on the peninsula; the cemetery was placed near the destroyed Guardhouse V. During the early postwar Stalinist era, Westerplatte was presented as a symbol of Poland's prewar anticommunist government and was marginalised in official history; Dr. Mieczysław Słaby, the garrison surgeon at Westerplatte, was arrested, tortured and died in the custody of the Ministry of Public Security in 1948. After the mid-1950s liberalization, Westerplatte was repurposed as a communist propaganda symbol; in 1956, the Polish Naval Academy was named for the "Heroes of Westerplatte", and that name began to be given to schools, streets, and other institutions. In 1962 a Christian cross at the cemetery was replaced with a Soviet T-34 tank, and the first government-organized remembrances began at Westerplatte. In 1966, a Westerplatte Monument, a -tall obelisk atop a mound, was erected at Westerplatte, set within a park, with smaller installations. Westerplatte became a popular tourist attraction. Later, Guardhouse I was relocated in order to save it from destruction during the construction of a new harbour channel. In 1971, Sucharski's grave was relocated to Westerplatte from his original burial place in Italy. In