Burgruine, Castle ruins in Franconian Switzerland, Germany

Burgruine is a medieval fortress in Franconian Switzerland consisting of stone remains on a high hill overlooking the surrounding forests and valleys. The ruins show the foundations of several buildings, tower remains, and what was once the central courtyard area.

Charles IV, King of Bohemia and Emperor, bought Pegnitz in 1357 and had Hollenberg built; a Bohemian official is recorded there in 1363, and the castle first appears in writing as "daz haus" von "Holenperg" in the 1366–68 Salbuch. During the war between King Wenceslaus and Rupert of the Palatinate it changed hands repeatedly and was damaged, passing to Rupert's son John of Wittelsbach in 1410. Hans von Rabenstein was its last resident official; it was probably destroyed in the Peasants' War of 1525 and was recorded as a ruin by 1570.

The ruins display traditional German fortress architecture with remnants of defensive towers and thick stone walls still showing their original layout. Visitors can see how the rooms and defensive structures once connected within the fortified complex.

The ascent to the ruins follows marked hiking paths starting from the parking area at the base of the hill. The terrain is accessible on foot, though sturdy shoes and some time are recommended.

About 97 metres below the ruins lies the Zwergenhöhle, a cave 97 metres deep that visitors often overlook. From the upper castle the view reaches west as far as Gößweinstein and its castle. The site is freely accessible via a hiking trail that climbs south from the hamlet of Hollenberg.