House of Terror museum contains exhibitions related to the fascist and communist dictatorial regimes in 20th-century Hungary and is also a memorial to the victims of these regimes, including those detained, interrogated, tortured or killed in the building. The museum opened in 2002.
With regard to communism and fascism, the exhibition contains material on the nation's relationships to Nazi Germany and the Soviet Union. It also contains exhibits related to Hungarian organisations such as the fascist Arrow Cross Party and the communist ÁVH (which was similar to the Soviet Union KGB secret police). Part of the exhibition takes visitors to the basement, where they can see examples of the cells that the ÁVH used to break the will of their prisoners.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.