Best castles around Au (SG) are found within the St. Gallen canton, a region characterized by its historical sites and varied landscapes. The area features a mix of medieval castle ruins and preserved historical structures. These landmarks provide insights into the region's past and offer viewpoints over the Rhine Valley and Lake Constance.
Last updated: October 9, 2026
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The historic Wartensee Castle, dating from the 13th century, is located on the Rorschacherberg hill. It also features a historic chapel, and the castle itself houses a Gothic hall. From the beautiful garden terrace, one has a breathtaking panoramic view of Lake Constance.
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Around 1100, the Count of Bregenz built the castle on a rocky outcrop of the Gebhardsberg, high above the city. "Sunken in holy enthusiasm..." begins a poem inspired by Hohen Bregenz Castle. In 1143, the castle passed to the Counts of Pulllendorf, and shortly thereafter, around 1170, to Count Palatine Hugo II of Tübingen (father of Hugo I, Count of Montfort). The upper part of the castle was sold to the Habsburgs in 1451, and the lower part in 1523, and the castle became the seat of Austrian bailiffs. Converted into a fortress at the beginning of the 17th century, the Swedes blew up large sections of the castle during the Thirty Years' War. The circular wall and parts of the palace survived. The attached church became a popular place of pilgrimage in honor of Saint Gebhard. The old sacristan's house, which has since been converted into a restaurant, looks forward to your visit. Even today, the fantastic view over the Rhine Valley and Lake Constance attracts numerous visitors.
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After the climb, the trip to the castle is worth it for the view. Great view over the lake.
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History of Hohenbregenz Castle. The castle was built in the last quarter of the 11th century (before 1097) by the Counts of Bregenz (Ulriche). The castle was first mentioned in a document in 1209. In 1143 the castle passed to the Counts of Pfullendorf, but only remained in their possession for a short time. Just a few years later (1170) it came to Count Palatine Hugo of Tübingen (father of Hugo I, Count of Montfort). The upper part of the castle was sold in 1451 and the lower part of the castle in 1523 to the Habsburgs, who made the castle the seat of Austrian bailiffs. At the beginning of the 17th century the castle was expanded into a fortress. In 1647, towards the end of the Thirty Years' War, they were able to capture Swedish troops without a fight. They blew up the fortress in the same year by setting off five mines (see Naval War on Lake Constance 1632–1648). Source: Wikipedia
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Very beautiful ruins, high above the Rhine Delta and Lake Constance. Above there is a nice viewing point and rest area with tables and benches.
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After a pleasant, cool climb through the forest you reach the Burghalde with the Grimmenstein castle ruins. A wonderful view opens up of Lake Constance and the three neighboring states.
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Access to the ruins is currently completely blocked (3.23).
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Wartensee Castle is located on a hill in Rorschacherberg above Lake Constance. It is surrounded by a large park and was once the country estate of a wealthy family. The history of the castle goes back to the 13th century. Its current form was achieved through a renovation in the 19th century. Only then did it acquire its current style, characterized by neo-Gothic elements. Today Wartensee Castle is used as a hotel and event location.
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The region around Au (SG) offers a diverse range of historical sites, from medieval castle ruins to preserved structures and even a UNESCO World Heritage site. You can find remnants like the Grimmenstein Castle Ruins and Alt-Ems Castle Ruins, which provide insights into the area's past and offer expansive views. Beyond traditional castles, the Abbey of St. Gallen, a UNESCO World Heritage site, is a significant cultural and historical treasure in the canton, renowned for its Baroque cathedral and ancient library.
Yes, Wartensee Castle in Rorschacherberg operates as a hotel and event venue. It's situated on a hill overlooking Lake Constance and offers a historic setting with modern amenities, including dining options. Its history dates back to the 13th century, with a Neo-Gothic appearance from 19th-century renovations.
For stunning views, the Grimmenstein Castle Ruins provide wonderful panoramas of Lake Constance and the three neighboring states after a pleasant climb through the forest. Similarly, the Alt-Ems Castle Ruins, one of the longest medieval castles, offers impressive views over the Rhine Valley from its elevated position at 740 meters above sea level.
Yes, several castles in the area are suitable for families. The Grimmenstein Castle Ruins are particularly family-friendly, featuring two barbecue areas for a fun experience. Wartensee Castle and Grünenstein Castle are also noted as family-friendly destinations, offering historical exploration in pleasant settings.
The region offers a variety of outdoor activities. You can find numerous routes for mountain biking, cycling, and mountain hikes. For example, there are MTB trails like the 'View of the Rhine Valley – St. Anton Viewpoint loop' starting from Au (SG), and cycling routes such as the 'Old Rhine – Earth House Altenrhein loop'. Mountain hikes, including challenging loops like 'Staufenspitze loop from Dornbirn', are also accessible. You can explore more options on the dedicated guides for MTB Trails around Au (SG), Cycling around Au (SG), and Mountain Hikes around Au (SG).
While many castles are privately owned, some offer public access or events. Grünenstein Castle, a private castle on a vineyard, has been made available to the public for cultural events, weddings, and other celebrations in its baroque garden and historic rooms. Anna Castle in Rorschach is also privately owned, but its exterior can be viewed as a historical landmark.
The Abbey of St. Gallen is a UNESCO World Heritage site, recognized for its profound historical, architectural, and cultural significance. It was a major center of learning and culture in medieval Europe. The complex features a magnificent Baroque cathedral and the renowned Abbey Library, which houses over 170,000 documents, including thousands of medieval manuscripts. Its opulent Rococo hall is considered one of Switzerland's most splendid spaces. You can learn more about its global significance on the UNESCO website.
For those interested in medieval history, the Alt-Ems Castle Ruins stand out as one of the longest medieval castles. The Alt-Rheineck Castle Ruins also offer a glimpse into the strategic importance of castles in controlling the Rheintal (Rhine Valley) during the Middle Ages, having been attacked and rebuilt multiple times. The Gebhardsberg Castle Ruins also have a rich history dating back to the 11th century.
Visitors frequently appreciate the stunning views offered by many of the castle ruins, such as those from Grimmenstein Castle Ruins over Lake Constance. The historical depth and the opportunity to explore ancient structures are also highly valued. Many enjoy the combination of nature and history, with pleasant climbs through forests leading to these significant landmarks. The presence of amenities like barbecue areas at Grimmenstein also enhances the visitor experience.
Yes, further south in the St. Gallen canton, you can find Schloss Sargans. It is a large and well-preserved castle that offers another historical destination for those exploring the region beyond the immediate vicinity of Au (SG).
Yes, Wartensee Castle operates as a hotel and event venue, allowing visitors to stay in a historic setting. For more options on castle hotels in the St. Gallen area, you might find additional information on specialized travel sites like Castles to Stay.


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