Ordensburg Vogelsang is a former National Socialist estate placed at the former military training area in Eifel National Park in North Rhine-Westphalia. The landmarked and completely preserved estate was used by the National Socialists between 1936 and 1939 as an educational centre for future leaders. Since 1 January 2006 the area has been open to visitors. It is one of the largest architectural relics of National Socialism. The gross area of the landmarked buildings is 50,000 m2.
In a 1933 speech in Bernau near Berlin, Adolf Hitler demanded that new schools be built for the children of the leaders of his national socialist German labour party (NSDAP). The task was given to Robert Ley, the "Reichsorganisationsleiter" (literally: Reich Organisational Leader) of the NSDAP, who undertook the construction and operation of four educational camps (NS-Ordensburgen):
A fourth one was planned at (the historic) Ordensburg Marienburg, in West Prussia.
The construction of Ordensburg Vogelsang, most of which lies within the district of the town of Schleiden, was financed by expropriating trade unions and employers' associations. The contract for planning the Krössinsee and Vogelsang projects went to the Cologne architect Clemens Klotz.
The three buildings at Eifel have been known as "NS-Ordensburg" since 1935. The first phase of the project was the construction of the Castle of Vogelsang, which with up to 1,500 workers took only two years. Several much bigger buildings were also planned, such as a huge library to be called the "House of Knowledge" (Haus des Wissens) measuring 100 metres by 300 metres, a "Kraft durch Freude" hotel with 2000 beds, and the biggest sports facilities in Europe. Construction at the site halted on the outbreak of war.