Fort Thüngen, Luxembourg

Fort Thungen, also affectionately known as the “Three Acorns” (Drai Eechelen), is a remarkable 18th‑century fortress perched above Luxembourg City in the Drai Eechelen Park, Kirchberg quarter. Built in 1732 under Austrian command to enclose the earlier Vauban-style Redoute du Parc, it was later expanded by Prussian forces in the 19th century before most of its structure was dismantled following the 1867 Treaty of Paris. Only the three distinctive round towers, each crowned with giant acorn motifs, survived intact along with the foundation walls, making them both emblematic and evocative remnants of Luxembourg’s fortress past.

Visitors can explore the Three Acorns Museum (Musee Drai Eechelen), opened in July 2012 within the fully restored fort, to trace Luxembourg’s history from 1443 to 1903. The museum’s permanent exhibit spans six underground casemate galleries filled with over 600 artifacts, maps, documents, and multimedia displays, supplemented by two additional casemates amply illustrating life and urban development in the capital over the centuries. From the rooftop terrace, sweeping panoramic views invite reflection on the verdant Alzette valley below and the contrasting modern skyline of the Kirchberg district, featuring the nearby glass pavilion of the MUDAM (Museum of Modern Art Grand‑Duc Jean).

The grounds themselves are equally inviting, located in a serene landscaped setting known as the Three Acorns Park (Parc des Trois Glands). A former deep moat, now a scenic garden, offers shaded paths ideal for a stroll or quiet respite. Guided tours are available and highly recommended for families and history enthusiasts to gain deeper insights into the site’s military significance and cultural identity.

Whether you're captivated by military architecture, fascinated by historical narratives, or simply seeking a tranquil spot with views of Luxembourg’s fortified past and vibrant present, Fort Thungen delivers a memorable blend of history, culture, and scenic charm.

Why You Should Visit:
There's a beautiful view from the walking path, and the fort itself is very impressive.
Each section takes you through the various histories of Luxembourg and how many times it changed hands until becoming its own country.
The artifacts and maps are very cool to see for anyone interested in this piece of history.
At the end, you can walk in the tunnels of the fort and then go to the top and walk along the roof.

Tip:
Visiting inside the fort requires admission; however, you can explore the outside walls for free!
As it is located in a pretty hilly area, you can just sit down and chill and enjoy the magnificent view of the city with no one to bother you.