Vienna

=== Austrian State Treaty and afterwards===
[[File:Graben, szemben a Pestisoszlop. Fortepan 58901.jpg|thumb|[[Graben, Vienna|Graben]] in 1966]]
The four-power control of Vienna lasted until the [[Austrian State Treaty]] was signed in May 1955. That year, after years of reconstruction and restoration, the [[Vienna State Opera|State Opera]] and the [[Burgtheater]], both on the {{lang|de|Ringstraße|italic=no}}, reopened to the public. The Soviet Union signed the State Treaty only after having been provided with a political guarantee by the federal government to declare Austria's neutrality after the withdrawal of the allied troops. This law of neutrality, passed in late October 1955 (and not the State Treaty itself), ensured that modern Austria would align with neither [[NATO]] nor the [[Soviet bloc]], and is considered one of the reasons for Austria's delayed [[1995 enlargement of the European Union|entry into the European Union in 1995]].

In the 1970s, [[Chancellor of Austria|Austrian Chancellor]] [[Bruno Kreisky]] inaugurated the [[Vienna International Center]], a new area of the city created to host international institutions. Vienna has regained much of its former international stature by hosting international organizations, such as the United Nations ([[United Nations Industrial Development Organization]], [[United Nations Office at Vienna]] and [[United Nations Office on Drugs and Crime]]), the [[Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization]], the [[International Atomic Energy Agency]], the [[OPEC|Organization of Petroleum Exporting Countries]], and the [[Organization for Security and Co-operation in Europe|Organization for Security and Cooperation in Europe]].