Fort Thüngen is a historical fortification that stands proudly in Luxembourg City, the capital of Luxembourg. Located on the eastern edge of the old city in the Kirchberg district, the fort is one of the country's most famous and recognizable landmarks. Its main feature is the three massive towers with domed roofs, which earned it the popular nickname "Three Acorns" (Dräi Eechelen) due to their characteristic shape.

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Built in 1732–1733 by the Austrian Baron von Thüngen, the fort was originally a key element of Luxembourg's powerful fortress system. Although most of the fortifications were dismantled after the Treaty of London in 1867, which proclaimed Luxembourg's neutrality, the three towers and the foundations of the rest of the fort were preserved and later meticulously restored. Today, it is not only an impressive monument of 18th-century military architecture but also an important symbol of the rich history of the city and the country.
Nowadays, Fort Thüngen is both a historical site and a significant cultural space. Within its restored walls, the Musée Dräi Eechelen (Three Acorns Museum) is housed, where the exhibition tells the fascinating story of the fortress and Luxembourg's national identity. The surrounding area, including the picturesque Dräi Eechelen Park and the nearby Grand Duke Jean Museum of Modern Art (MUDAM), has turned this location into a popular area for walks, educational tours, and various cultural events, attracting both tourists and locals.