The Château of Val-Duchesse, located in Auderghem, Brussels, occupies the grounds of a former Benedictine priory founded in 1262. This elegant mansion, built in the early 20th century on the historic estate, served as the venue for the landmark 1956 Intergovernmental Conference on the Common Market, which led to the Treaties of Rome and the foundation of the European Economic Community. Today, the château remains an important state property of the Belgian Royal Trust, used for hosting international dignitaries and diplomatic negotiations. Though not open to the public for regular tours, its storied gardens and stately architecture represent significant chapters in both European history and Belgian heritage.