The remains of the castle can be visited
Bohlingen Castle

The castle ruin of Bohlingen, once also known as the Feste auf der Burghalde, is a spur castle ruin in Singen's Bohlingen district in the Konstanz region. Its history is closely intertwined with local noble families and ecclesiastical institutions.
History+
The origins of Bohlingen Castle date back to 1175, when it served as the seat of the local Bohlingen nobility, who were ministeriales under the bishop. In the 14th century, ownership passed to the Lords of Homburg. The first documented mention of a "vesty by der Kilchen" occurred in 1455, when the castle came into the possession of Salem Abbey. Later, it belonged to the Counts of Sulz, before Konstanz Abbey reacquired it in 1497. In 1512, it was referred to as "Baltzbronn-Schloss," and in 1535, a "Neues Haus" (New House) is mentioned in the context of the castle. The castle was destroyed in 1640 during the Thirty Years' War by Konrad Widerholt. In 1687, permission was granted to demolish parts of the complex for the construction of a church. In the early 19th century, a rectangular tower on the east side was demolished, and in 1990, a new building was erected north of the remaining tower on the site of an older structure.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: JLaetus / CC BY-SA 4.0 via Wikimedia Commons
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: 47.7205, 8.8944