Bjärsjöholm or Bjersjöholm Castle is a Renaissance castle from the 16th century. Originally consisting of four brick buildings built around a courtyard, the present castle consists of two buildings, with a newer addition close by.
According the excavations there has been a manor already in the Middle Ages. The site is first mentioned in 1344. Since the 14th century it has been owned by families Munk, Rotfeld, Kaas, Ugerup and Thott. In 1668 Bjärsjöholm was acquired by Ebba Brahe, wife of Jacob de la Gardie. After de la Gardies it has belonged for example to the war marshal Otto Wilhelm Königsmarck.
The newer addition on the estate, the Bergsjöholm Castle, was built in Romantic, German style in 1849-50, on a hill just south of the old castle. It is a three-story building flanked by two square towers. In 1890, one of the Renaissance buildings needed extensive renovations and only the gables could be saved.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.