For the upcoming Open Monument Day on September 13, 2026, numerous historical buildings, castles, and technical monuments across Thuringia will exclusively open their doors. To assist history enthusiasts with their planning, this service guide summarizes ten selected insider tips by region and provides all necessary details regarding addresses and guided tours.
- Important Service Information:
- Date: Sunday, September 13, 2026
- Occasion: Nationwide Open Monument Day
- Offer: Free or guided insights into rarely opened historical structures in Thuringia.
Excursion Destinations at a Glance: Regional Highlights
1. Kleineutersdorf & Hummelshain (Saale-Holzland-Kreis)
The Herzogstuhl, a half-timbered hunting lodge hidden in the forest and dating back to 1915, grants rare insights into its interior.
- Address: Parkplatz Am Chausseehaus, 07768 Hummelshain (approx. 5.4 km hike to the Herzogstuhl in the Rieseneck forest area)
- Program: September 13, 2026, from 10:00 AM opening by the District Administrator, exclusive tour of the eight floors and the cellar.
2. Ilmtal-Weinstraße (Weimarer Land District)
The medieval Burg Denstedt today combines modern fitness and health services with historical building fabric.
- Address: Burg Denstedt 1, 99510 Ilmtal-Weinstraße
- Program: Free access, wheel of fortune and catering provided by the fire department association; 3:00 PM guided tour with local chronicler Gunter Braniek; 5:00 PM organ concert in the neighboring church.
3. Neudietendorf (near Erfurt)
The historical manor “Alter Hof” from the 18th century showcases exemplary monument preservation and modern living space.
- Address: Zinzendorfstraße 16, 99192 Neudietendorf
- Program: Open from 11:00 AM to 5:00 PM; historical river stone paving for participation, tower campaign for the preservation of the roof turret, as well as coffee and cake.
4. & 5. Weimar
In Weimar, two contrasting monuments are on the program: the historical Gestapo cellar and a former industrial area.
- Marstall Weimar: Marstallstraße 2, 99423 Weimar. Program: Guided tours at 1:00 PM, 2:00 PM, 3:00 PM, and 4:00 PM through the cells in the former Gestapo cellar.
- Alte Feuerwache Weimar: Erfurter Straße 39, 99423 Weimar. Program: Guided tours at 10:00 AM and 12:00 PM through the renovated Wilhelminian-style quarter.
6. Eichsfeld (Lengenfeld unterm Stein)
Schloss Bischofstein currently serves as a senior care facility and offers a family-friendly program.
- Address: Bischofstein 1, 99976 Lengenfeld unterm Stein
- Program: 2:00 PM “Knight’s Tour for Young & Old”, audio guides for the castle, guided tours to the old forest cemetery, and catering from 12:00 PM to 5:00 PM.
7. Blankenhain (Thangelstedt district)
The Baroque manor house in Thangelstedt features original room structures and an inlaid floor.
- Address: Dorfstraße 1, 99444 Blankenhain
- Program: Guided tours every 45 minutes or as needed. A village tractor meeting with catering takes place in parallel.
8. Altenburg
At the local train station, one of the last technical testimonies of railway history can be visited.
- Address: Eisenbahnstraße 19, 04600 Altenburg (Train Station)
- Program: From 10:00 AM guided tours (duration: approx. 30 minutes) through the electromechanical signal box B5 with a historical lever frame.
9. Jena
The historical forest observatory offers exclusive insights into astronomical technology, weather permitting.
- Address: Forstweg 88, 07745 Jena
- Program: Guided tours by the Volkssternwarte Urania Jena e.V. association; in good weather, solar observations with the historical Cassegrain reflecting telescope.
10. Gera
The Pfarrgut Niebra in the Niebra district is one of the oldest buildings in the area and opens its historical ensemble.
- Address: Pfarrgut Niebra, 07551 Gera
- Program: From 2:00 PM coffee and cake in the courtyard; at 2:00 PM and 4:00 PM creative workshop “Draw the Monument”.
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Illustrated Book: Historical Castles and Palaces in Thuringia
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Background: Open Monument Day
Open Monument Day is Germany’s largest cultural event and is coordinated by the German Foundation for Monument Protection (DSD). Since 1993, it has opened the doors of otherwise often closed cultural monuments annually on the second Sunday in September. In Thuringia, the respective regional monument protection authorities and associations coordinate a diverse program that makes historical building culture tangible for the public.
Source:
Open Monument Day 2026: 10 Insider Tips in Thuringia, Open for One Day Only
Transparency Note: This article was created automatically, editorially reviewed, and expanded with AI support.