The foundation for Lohr Castle, first mentioned in records in 1389, was laid around 1340 by Count Gerhard V of Rieneck at the northwest corner of the old town of Lohr am Main. Initially, it was just a residential tower modeled after Flemish designs, which was surrounded by a moat and a ring wall from the late 15th century onwards. Nearby were buildings such as the bandhouse, forestry office, coach house, and cellar.
After the death of the last Count of Rieneck, Philipp III, the Electors of Mainz took over the building in 1559 as regional rulers and gradually gave it its present form. It became the seat of the Electorate's senior officials. The most well-known official was Philipp Christoph von und zu Erthal, who used the castle as his residence from his appointment in 1719 until his death in 1748. His two princely sons, Friedrich Karl Joseph von Erthal, one of the last Electors of Mainz and Prince-Bishop of the Diocese of Worms, and Franz Ludwig von Erthal, born in Lohr and later Prince-Bishop of Bamberg and Würzburg, were raised here.
In 1814, the Kingdom of Bavaria took over the castle and used it as an administrative seat. Among other things, it housed the district office of the Lohr district until the territorial reform of 1972. The building was renovated in 1913.
In the castle's Knight's Hall, the Lohr Museum of Local History and the Spessart Museum were established in 1936. The museum was closed in 1942 and reopened in 1949. Since 1972, only the Spessart Museum remains in the building, focusing on the history of the castle and the Spessart region, with an emphasis on the relationship between people and the forest.
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.