Best natural monuments around Altnau are found in a region characterized by its location on the southern shore of Lake Constance in Thurgau, Switzerland. This area features a moraine landscape shaped by glaciers, fostering extensive fruit cultivation, particularly apples. The picturesque environment includes unique wetland ecosystems and vast orchards. It offers a diverse natural landscape for exploration.
Last updated: April 28, 2026
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Is actually only worth it if you are there anyway. The best thing is the view from the opposite slope.
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A very varied and interesting hike with good signage and paths
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Seeburg Castle in Kreuzlingen looks like something out of a fairy tale with its turrets and bay windows, rose garden, fountain and view of Lake Constance.
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More information at the following link: https://de.m.wikipedia.org/wiki/Schloss_Seeburg_(Kreuzlingen)
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More information at the following link: https://de.m.wikipedia.org/wiki/Schloss_Seeburg_(Kreuzlingen)
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Great tour, good basic construction and surefootedness required, some sections of the route are more difficult to walk on
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An open-air theater takes place here every summer. https://www.see-burgtheater.ch
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The Altnau region, shaped by glacial moraines, offers diverse natural features. You can explore the unique wetland ecosystem of the Hudelmoos Nature Reserve, a high moor with luminous birch trunks, dense reed belts, and glittering streams. Another highlight is Bommer Weiher Water Lilies, a tranquil lake known for its prominent water lilies and opportunities for birdwatching.
Yes, the Last Ruin is considered both a historical site and a natural monument. It features an old ruined tower of a hilltop castle, dating back to the 12th century, offering viewpoints and trails along the Schönenberger Ruinenweg.
The region around Altnau is excellent for various outdoor activities. You can find numerous routes for cycling, gravel biking, and running. For example, there are cycling routes like the 'Emmerzer Pond – Bommer Weiher Water Lilies loop' or running trails such as the 'Altnau Apple Trail – View of Lake Constance loop'. You can explore more options on the Cycling around Altnau, Gravel biking around Altnau, and Running Trails around Altnau guide pages.
Absolutely. The Hudelmoos Nature Reserve and Bommer Weiher Water Lilies are both considered family-friendly. Additionally, the Altnau Apple Trail, while not a traditional monument, is a themed walking route through orchards with information panels, puzzles, and facts about apples, making it engaging for families, especially during the apple blossom season.
The Altnau region is beautiful year-round, but spring and late summer offer unique experiences. In spring, the extensive fruit orchards, particularly around the Altnau Apple Trail, transform into a 'white sea of blossoms' (Bluescht), creating a breathtaking spectacle. Late summer brings the Altnau Apple Weeks, culminating in an autumn market, which is also a great time to visit.
There is a suitable, larger car park available at the Hudelmoos Nature Reserve Parking Area. It is free and provides convenient access to the nature reserve.
The Hudelmoos Nature Reserve is a significant high moor that has been regenerating since being placed under cantonal protection in 1977. It's known for its unique landscape features like luminous birch trunks, dense reed belts, and vibrant swamp marigolds. It's also a biodiversity hotspot, home to numerous species of birds, butterflies, dragonflies, and plants, offering a tranquil and historically significant wetland environment.
While Altnau is directly on Lake Constance, offering stunning views, the Seeburg Castle in Kreuzlingen, though a bit further, is a historical site and natural monument that provides picturesque views of the lake. The longest pier on Lake Constance, the Altnauer Bodenseesteg, also extends into the lake from Altnau, offering fascinating lake views.
The Altnau Apple Trail is a themed walking route that winds through the region's extensive apple orchards. It features 24 information panels with puzzles, jokes, and facts about apple varieties and fruit growing. It's particularly worth visiting in spring during the 'Bluescht' (apple blossom) season for the 'white sea of blossoms' or in late summer during the Altnau Apple Weeks to learn about local agriculture and enjoy the scenic 'fruit paradise'. More information can be found at myswitzerland.com.
Visitors frequently praise the absolute tranquility and opportunities for stress relief, especially at places like Bommer Weiher Water Lilies. The unique landscapes of the Hudelmoos Nature Reserve, with its springy ground and rich biodiversity, are also highly appreciated. The scenic beauty of the orchards, especially during blossom season, and the clear waters of Lake Constance are also major draws.
Yes, the Hudelmoos Nature Reserve is categorized as intermediate, offering paths to explore the high moor. Additionally, the trails around the Last Ruin, such as the Schönenberger Ruinenweg, are also suitable for intermediate levels.


Extend your search for the best caves by checking out these guides of the top ones around Altnau: