Castles around Lengwil offer a rich historical and cultural experience within the canton of Thurgau, Switzerland. While Lengwil itself is a smaller municipality, the surrounding Lake Constance region provides access to numerous historically significant castles. This area is characterized by its scenic landscapes and proximity to the Bodensee. Visitors can explore a variety of historical sites, from medieval fortresses to baroque palaces.
Last updated: July 6, 2026
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There is documented evidence of winegrowing in Meersburg since 1324. The historic buildings from the early 18th century and the vineyards were owned by the Prince-Bishops of Constance until 1802/1803. During secularization, the winery fell to the Grand Duchy of Baden and became the first wine-growing domain in Germany as the Grand Ducal Baden Domain Winery. After the First World War, in 1919, it was renamed Meersburg State Winery. As the legal successor to the state of Baden, the state winery now belongs to the state of Baden-Württemberg. Text: Wikipedia
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Impressive building on the vineyard
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The Meersburg State Winery towers above vineyards.
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Mainau Castle Baroque jewel in the middle of the island The architectural centerpiece is Mainau Castle, the Teutonic Order castle. It was built between 1739 and 1746 according to the plans of Johann Caspar Bagnato and he also supervised the construction. Despite limited financial resources, an architecturally extremely balanced and symmetrical palace complex was created that exudes great harmony. The two side wings open in a horseshoe shape towards the mainland, while the wide side faces Lake Constance. The building consists of a base on which two floors rise. The coats of arms of the Grand Master Clemens August of Bavaria, the Land Commander Philipp von Froberg and the Mainau Commander Friedrich von Baden can be seen particularly magnificently on the west gable. The east gable facing the lake bears the coat of arms of the Teutonic Order. The upper floors can be reached via simple staircases in the side wings. The heart of the castle is the former audience hall, the so-called “White Hall” decorated in white and gold, which only received its current appearance in 1883. It is only open to the public during concerts or special events. The lower area of the castle is open to visitors. Exhibitions regularly take place here in the historic coat of arms hall. Text / Source: Mainau GmbH https://www.mainau.de/de/gehenswuerdigkeiten/schloss-mainau
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Hagenwil is a well-preserved, well-maintained moated castle and a worthy representative of the olden days
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The Meersburg State Winery combines all of this, with wine lovers and gourmets getting their money's worth. Over 800 years of tradition are embedded in the walls and vineyards of the winery. The imposing wine cellar with a view of the lake was built in the former moat. The large wooden barrels in which the wine can mature are still stored there today.
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This castle is even considered the only preserved moated castle in Switzerland! Further information: https://www.teddy-b.ch/excursion destinations/wasserschloss-hagenwil-tg-traumschloss-in-mostindien/
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The Deutschordenschloss was built from 739 to 1746 according to the designs of Johann Caspar Bagnato and under his supervision. Despite limited finances, an architecturally highly balanced, symmetrical palace complex of great harmony was created. The arms of the two side wings open towards the mainland in the shape of a horseshoe. In contrast, the wide side faces the lake. The building rests on a plinth over which two floors rise. Magnificent on the west gable: the coats of arms of the Grand Master Clemens August von Bayern, the Land Commander Philipp von Froberg and the Mainau Commander Friedrich von Baden. The east gable on the sea side bears the coat of arms of the Teutonic Order. In his design, Bagnato dispenses with a magnificent representative staircase based on the Würzburg model. The upper floors can be reached via simple staircases in the side wings. The heart of the castle is the former audience hall, the so-called "White Hall", which is kept in white and gold and only got its current appearance in 1883. It is only open to the public for concerts or special events. The Coat of Arms Hall, the central room in the basement of the original Corps de Logis, is also open to the public for changing exhibitions. In addition, the rooms of the castle café in the transition to the palm house. With their clear architectural language, the castle and church form a magnificent, harmonious ensemble - they are a unique example of southern German baroque. Source: https://www.mainau.de/de/ariatlementen-detail/ariat/barockschloss.html
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While Lengwil itself is a smaller municipality, the surrounding Lake Constance region offers several historically significant castles. You can explore sites like Hagenwil Moated Castle, a nearly 800-year-old fortress, or the Baroque Mainau Castle on Mainau Island. Other notable castles in the broader region include Arenenberg Castle, known for its Napoleonic history, and the medieval Meersburg Castle across Lake Constance.
Arenenberg Castle, located in Salenstein a short distance from Lengwil, is a key site for Napoleonic history. It was the residence of Hortense de Beauharnais, Queen of Holland and stepdaughter of Napoleon Bonaparte, and later her son, Emperor Napoleon III. The castle houses the Napoleon Museum, offering extensive collections and insights into their lives.
Yes, the region boasts several medieval castles. Hagenwil Moated Castle is a well-preserved example dating back to the 13th century. Across Lake Constance, Burg Meersburg is considered one of Germany's oldest inhabited castles, featuring a museum with knight's halls and a dungeon. Hohenklingen Castle near Stein am Rhein also offers a medieval experience with stunning views.
For a deep dive into the history of the Thurgau canton, visit Frauenfeld Castle in Frauenfeld, the capital of Thurgau. This 13th-century castle now houses the Thurgau Historical Museum, displaying a wide range of artifacts related to the canton's rich past.
Many castles in the area are suitable for families. Hagenwil Moated Castle offers a historic setting with a restaurant. Mainau Castle is part of the popular Mainau Island, which has plenty of attractions for all ages. Meersburg Castle (Burg Meersburg) features a museum with knight's halls and a dungeon, which can be engaging for children.
Several castles provide breathtaking views of Lake Constance. Meersburg State Winery and Castle Park offers vineyard views over the lake. Arenenberg Castle features beautiful gardens with stunning lake panoramas. The New Palace, Meersburg, also provides an overwhelming panoramic view over Lake Constance and the lower town.
The region around Lengwil and its castles is excellent for outdoor activities. You can find numerous cycling routes, such as the 'Weinfelden Old Town loop' or the 'Lake Promenade in Uttwil – Lake Constance Cycle Route loop'. For mountain biking, explore trails like the 'Lake Constance cycle path' or the 'Bommer Pond – Forest Trail Thurgau loop'. Gravel biking options are also available, including routes like 'View of Lake Constance – Napoleon Tower loop'. You can find more details on these activities in the cycling, MTB, and gravel biking guides for Lengwil.
While specific hiking trails directly at every castle are not detailed, many castles are situated in scenic areas conducive to walking. Arenenberg Castle, for example, is surrounded by beautiful gardens and offers opportunities for walks with lake views. Hohenklingen Castle is perched on a hill overlooking Stein am Rhein, providing a great starting point for exploring the charming town and surrounding nature. For more structured outdoor routes, consider the cycling, MTB, and gravel biking guides for Lengwil, which often pass by or near these historical sites.
The best time to visit castles around Lake Constance is generally during the warmer months, from late spring to early autumn (May to October). During this period, the weather is pleasant for exploring castle grounds and gardens, and for enjoying the scenic views over the lake. Many attractions, including museums and restaurants within the castles, operate with extended hours. The vibrant colors of spring and autumn also add to the picturesque setting.
Public transport options are available for many castles in the wider region. For instance, Arenenberg Castle in Salenstein is accessible by public transport, though specific routes may require a combination of train and bus. Meersburg Castle, while in Germany, is easily reached by ferry from the Swiss side of Lake Constance, connecting to local German public transport. For specific routes and schedules, it's best to check local transport websites for the Thurgau canton and the Lake Constance region.
Visitors particularly appreciate the rich history and cultural experiences offered by the castles. Many enjoy the well-preserved architecture, the insightful museums, and the stunning views over Lake Constance and the surrounding landscapes. The opportunity to combine historical exploration with outdoor activities like cycling or walking, and to enjoy local delicacies at castle restaurants, is also highly valued.
Yes, the region is known for its viticulture. The Meersburg State Winery and Meersburg State Winery and Castle Park have a tradition dating back over 800 years. They offer wine tours and tastings, allowing visitors to experience the historical connection between the castles and local wine production, often with beautiful views over Lake Constance.


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