Burg Neunußberg, Castle ruin in Viechtach, Germany

Burg Neunußberg is a castle ruin in Viechtach featuring a stone residential tower roughly 25 meters high with five stories. A chapel dedicated to Saint Michael occupies the grounds and dates to around 1350.

Konrad von Nußberg built the castle between 1340 and 1350, and his family moved here from their ancestral seat at Burg Altnußberg. In the Böcklerkrieg, Warmund and Konrad von Nußberg sided with 41 Bavarian nobles against Duke Albrecht IV; after their defeat they sold the castle, Warmund in 1469 and Konrad in 1470. A lightning strike destroyed it in 1564, and when the family died out in 1569 it passed as a ruin to the Wittelsbachs.

The castle chapel, restored, dates from 1356 and holds baroque furnishings: the high altar was made around 1720 and its altarpiece depicts Saint Michael. Inside are also a painting of Saint Raphael with Tobias (around 1650), a Mater dolorosa (around 1700) and a simple 17th-century statue of Saint Michael.

The tower is open as a viewing platform; a donation known as the "Burggroschen" is requested at the ascent. The ruin stands on the flat 698.2 m summit of the Neunußberger Schlossberg, about 290 m above the Schwarzer Regen valley, roughly 3,950 m east of Viechtach's parish church of St. Augustinus. The site is reached on foot.

The tower is reached by paying the "Burggroschen", a donation requested at the ascent to the castle; it serves as a viewing tower over the Schwarzer Regen valley. The castle festivals, held on the Burganger since summer 1968, stage Karl Gareis's play about the 1468 knights' revolt.