Spa is a Belgian town located in Liège Province, and the town where the term spa originates. Spa is one of Belgium's most popular tourist destinations, being renowned for its natural mineral springs and production of 'Spa' mineral water, which is exported worldwide. In 2021, the town became part of the transnational UNESCO World Heritage Site under the name 'Great Spas of Europe'.
As the site of cold springs with alleged healing properties, Spa has been frequented as a watering-place since the 14th century. It is the town of Spa which has become eponymous with any place having a natural water source that is believed to possess special health-giving properties, known as a spa. The Spa town grew at that time, in the oldest iron and steel centre of Liège Province. The ban Spa was created around 1335 and included two urban concentrations, vilhe of Creppe and vilhe Spas, 2 kilometres away. Prior to the exploitation of mineral water, the steel industry developed communication lines, which made it possible to develop the spa town.
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Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.