The remains of the Castle can be visited
Hugofels Castle (Ruin)

The Hugofels ruin, once part of a double castle complex, is on a wooded ridge above the Alpsee lakes near Immenstadt in Oberallgäu. Its residential tower with four corner turrets is a rare sight in the German Alpine region, likely inspired by French or Swiss models.
History+
The origins of the Hugofels hilltop castle date back to the first half of the 13th century. It probably originated as an outwork of Rothenfels Castle, located to the southwest, which was built at the same time by the Lords of Schellenberg. Around 1332, the complex passed to the Counts of Montfort-Tettnang. Count Hugo XIII of Montfort settled in the double castle around 1440 and, after a fire, initiated renovations and extensions from 1462, including the vaulting of the cellar floor. At this time, the castle likely served primarily as a storehouse, as life in the lower-lying Rothenfels Castle was preferred. In 1525, the double castle was allegedly unsuccessfully besieged by peasants during the German Peasants' War.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 47.5700, 10.2073