In 963, Count Siegfried laid the foundation for what would eventually become a bustling city by constructing a fortified castle on the Bock promontory. Over the centuries, this stronghold expanded with imposing ring walls on the western side. However, these fortifications were not enough to deter the Burgundians from capturing the city in 1443. As history unfolded, the city fell into the hands of various powers: the Burgundians, Spaniards, French, Austrians, and the German Confederation. Each contributed to transforming it into one of the world's mightiest fortresses, earning it the nickname "Gibraltar of the North." The city's defenses were a marvel of military architecture, reinforced by three fortified rings featuring 24 forts and 16 other strong defensive structures. An extraordinary 23-kilometer network of casemates added to its formidable reputation. These underground passageways were more than just a military asset; they provided shelter for thousands of soldiers and their horses, and housed essential facilities like workshops, kitchens, bakeries, and slaughterhouses. Today, visitors can wander through these historic casemates, marveling at the engineering prowess of the past. The labyrinthine tunnels offer a fascinating glimpse into the life of a fortress city, with echoes of history lingering in every corner. For those interested in military history or simply seeking a unique adventure, the Bock Casemates are an unmissable experience. The panoramic views from the top, overlooking the city, are simply breathtaking.