Cecilienhof Palace () is a palace in Potsdam, Brandenburg, Germany, built from 1914 to 1917 in the layout of an English Tudor manor house. Cecilienhof was the last palace built by the House of Hohenzollern that ruled the Kingdom of Prussia and the German Empire until the end of World War I. It is famous for having been the location of the Potsdam Conference in 1945, in which the leaders of the Soviet Union, the United Kingdom and the United States made important decisions affecting the shape of post World War II Europe and Asia. Cecilienhof has been part of the Palaces and Parks of Potsdam and Berlin UNESCO World Heritage Site since 1990. Location Cecilienhof is located in the northern part of the large Neuer Garten park, close to the shore of the Jungfernsee lake. The park was laid out from 1787 at the behest of King Frederick William II of Prussia, modelled on the Wörlitz Park in Anhalt-Dessau. Frederick William II also had the Marmorpalais (Marble Palace) built within the Neuer Garten, the first Brandenburg palace in the Neoclassical style erected according to plans designed by Carl von Gontard and Carl Gotthard Langhans, which was finished in 1793. Other structures within the park close to Schloss Cecilienhof include an orangery, an artificial grotto (), the "Gothic Library", and the Dairy in the New Garden, also constructed for King Frederick William II. The park was largely redesigned as an English landscape garden according to plans by Peter Joseph Lenné from 1816 onwards, with lines of sight to nearby Pfaueninsel, Glienicke Palace, Babelsberg Palace, and the Sacrow Church. Construction Since the Marmorpalais, which had been the traditional Potsdam residence of the Hohenzollern crown prince, had become inadequate for current tastes, Emperor Wilhelm II ordered the establishment of a fund for constructing a new palace at Potsdam for his oldest son, Crown Prince Wilhelm (William) and his wife, Duchess Cecilie of Mecklenburg-Schwerin on 19 December 1912. After their marriage in 1905, Wilhelm and Cecilie had previously lived at the Marmorpalais for most of the year and at the Berlin Kronprinzenpalais in winter. In 1911, the Crown Prince had been appointed commander of the Prussian 1. Leibhusaren-Regiment and moved to Danzig-Langfuhr. On 13 April 1914 the Imperial Ministry and the Saalecker Werkstätten signed a building contract that envisaged a completion date of 1 October 1915 and a construction cost of 1,498,000 Reichsmark