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Bock Casemates
The Bock Casemates — underground tunnels carved into the Bock promontory by Burgundian, Spanish, French (Vauban), and Austrian engineers — are the surviving core of the Fortress of Luxembourg, once called the 'Gibraltar of the North.' These tunnels, part of a UNESCO World Heritage Site since 1994, let you walk through the defensive layers that made Luxembourg a strategic prize for three and a half centuries of foreign rule. Anchor modes: material_layer; custodian | Search hooks: Bock Casemates; Gibraltar of the North; fortress tunnels; UNESCO World Heritage; Vauban fortifications; underground casemates
Walk kilometres of underground tunnels through the Bock casemates, see the cannon emplacements and ventilation shafts, and read the interpretive panels explaining the fortress's Burgundian-Spanish-French-Austrian construction phases.