Burg Hugofels, Medieval castle ruins on hilltop in Immenstadt, Germany

Burg Hugofels is a ruin on the highest point of a narrow ridge northeast of Burg Rothenfels, above the Great and Small Alpsee near Immenstadt. Its nearly square residential tower, about 21 by 21 metres, stands buried in a roughly five-metre mound of rubble; the south wall of large Nagelfluh conglomerate blocks is best preserved. Two corner turrets about 7.7 metres across survive and now serve as viewpoints.

The castle was built in the early 13th century as part of a dual fortress complex with the neighboring Burg Rothenfels. It gradually lost importance after passing into the hands of the Counts of Königsegg-Aulendorf in 1567.

The square residential tower with four corner reinforcements represents an architectural design rarely found in the German Alpine region, following French and Swiss models.

The ruin site is freely accessible and offers two natural viewpoint areas on the remaining walls with views over the Alpsees and surrounding valley. Information boards at the location explain the building history and help visitors understand the different structures of the fortification.

The rectangular cistern in the northeast corner of the tower lies about three metres below the cellar floor. Water was drawn from the upper storeys through a shaft, and the cellar vault itself is now reachable only through a round light and ventilation opening in its ceiling.