| Marienberg Fortress | |
|---|---|
Festung Marienberg | |
| Near Würzburg, Germany | |
 Fortress Marienberg and the Old Bridge | |
  Marienberg Fortress  Marienberg Fortress | |
| Coordinates | 49°47′23″N 9°55′17″E / 49.789722°N 9.921389°E |
| Type | Fortress |
| Site information | |
| Owner | Bavarian Administration of State-Owned Palaces, Gardens and Lakes |
| Open to the public | Yes |
| Site history | |
| Built | mostly 13th to 18th century |
| Built by | Bishops of Würzburg |
Marienberg Fortress (German: Festung Marienberg) is a prominent landmark on the left bank of the Main river in Würzburg, in the Franconia region of Bavaria, Germany. It is a symbol of Würzburg and served as a home of the local prince-bishops for nearly five centuries. It has been a fort since ancient times, although most of the current structures were built in Renaissance and Baroque styles between the 16th and 18th centuries. After Gustavus Adolphus of Sweden conquered the area in 1631 during the Thirty Years' War, the castle was reconstructed as a Baroque residence. After it ceased to serve as residence of the Bishops of Würzburg, the fortress saw repeated action in the wars of the late 18th and 19th centuries. It was severely damaged by British bombs in March 1945 and only fully rebuilt in 1990. Today, it houses two museums.