Bastionder

Museum inside the underground 16th-century bastion of the city's fortifications

The Bastionder museum is built into the Bastion Oranje, one of the best-preserved sections of Den Bosch's 16th-century Spanish fortifications. The bastion is a massive underground structure of arched brick chambers and tunnels designed to protect the city from artillery bombardment — and remarkably, most of it survives intact.

The museum tells the story of Den Bosch's fortifications and the dramatic 1629 siege that ended Spanish rule in the city. The underground spaces themselves are the main attraction: low brick vaults, gunpowder stores, and sally port tunnels give you a vivid sense of what it meant to defend and besiege a fortified city in the 17th century. A good combination with a walk along the remaining city walls above.

things to do museum sight
A story
Den Bosch held out against Dutch siege for decades during the Eighty Years' War, its massive Spanish-built fortifications resisting assault after assault. When the city finally fell to Frederick Henry of Orange in 1629 after a four-month siege — one of the longest of the war — the victors were so impressed by the defences that they largely left them intact. You can still walk them today.