Weissenau Castle

Weissenau Castle is a castle ruin in Unterseen situated along the shore of Lake Thun with remnants from different periods. The standing tower, partially collapsed walls, and sections of the original curtain wall form the visible remains of this former fortress.

The fortress was first recorded in 1298 and functioned as a defensive structure protecting mountain routes. It gradually lost importance during the 16th century and eventually fell into ruins.

The castle once served as a key defensive structure for the region and is now protected as a nationally significant cultural property. Visitors can explore the ruins within a park-like setting that preserves the historical importance of the location.

The ruins are accessible via walking paths through the protected park area along Lake Thun's shore and can be explored on foot. The site offers open access with good views of the lake and surrounding landscape.

The castle originally stood on an island at the mouth of the Aare River and was gradually connected to the mainland through natural sediment buildup over centuries. This geological transformation makes the location singular in its landscape history.

Location: Unterseen

Part of: list of cultural properties in Unterseen

GPS coordinates: 46.67010,7.83236

Latest update: December 9, 2025 12:20