Książ Castle, around an hour from Wrocław, is Poland's third-largest – a clifftop complex with grand halls that has passed through Habsburg, Prussian and German hands.
Beneath it lies a network of unfinished tunnels, dug under a secretive Nazi wartime project. Guided tours combine the castle's staterooms with a walk into part of this tunnel system.
A day trip usually pairs the castle with the surrounding park and, for plant lovers, the nearby Palm House – a full day away from the city at an easy pace.
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About an hour by car, making it an easy half-day or full-day trip when paired with the nearby Palm House at Wałbrzych.