The Austrian landscape is characterized by a variety of castle complexes and castle ruins. The fortress Guessing, based on a volcanic cone, is one of the oldest of its kind in the province of Burgenland. Since the year 1198, the castle, former known as -Német Ujvar- (translated -New Castle-) was an important fortification in charge of the defence of the disputed border areas. As a reaction to the ongoing threat posed by its enemies and the historic development of new weapons, the fortification was until the 18th century steadily expanded and strengthened. A loss in the strategic significance of fortifications brought the expansion of the fortress to an end and triggered the dilapidation of the castle. Only in the 1950s a substantial restauration of the former fortification started. A detailed analysis, concentrating on set construction activities at the fortress Guessing, in particular the western Ujlaky-tower, shall lead to a comprehensive overview of the by the Austrian Federal Monuments Office supervised construction activities of the last 65 years. Furthermore, a future strategy for the castle that is based on the preservation of historical monuments and its conceptual approach, shall be developed.