Klessheim Palace is located four kilometers west of the center of Salzburg, surrounded by a large park and a creek. In addition, in the historical park of the Summer Palace has a golf course. Klessheim is the former residence of the Archbishops of Salzburg, and at the present time, the only year-round casino.

Originally this place was a small manor house, which was acquired by Prince-Archbishop Johann Ernst von Thun in 1690. The architect Johann Bernhard Fischen turned it into a beautiful palace, but after the death of the archbishop in 1709, his successor, stopped all construction work in favor of the castle Mirabell. He graduated from the decoration of the palace Count Leopold von Firmian Anton, who also worked with the castle Leopoldskron. Count expanded the terrace of the assembly hall, leading to the gardens. In the late 18th century the palace was broken wonderful picturesque English park during the reign of Archbishop Hieronymus von Colloredo. During the Austro-Hungarian Empire, the castle has been since 1866 in the possession of Archduke Ludwig Victor, the younger brother of Emperor Franz Joseph I.

After the Anschluss of Austria in 1938, Adolf Hitler used Klessheim for conferences and official meetings. In particular, in the castle there were visits to Benito Mussolini, Miklos Horthy, Ion Antonescu, Jozef Tiso. During a visit to the Klessheim Horthy, Hitler March 19, 1944 secretly ordered to occupy Hungary and the deportation of Hungarian Jews to Auschwitz.

Until October 1944 the palace remained beyond the reach of the allied bombers. In May 1945 he was captured by the US military administration.

After the war, the palace was restored and transferred to Salzburg. During the Cold War, neutral Austrian government used it for conferences and accommodation of foreign guests, among whom was the US President Richard Nixon.

Since 1993 the palace housed the casino.