[Answer] Where is this hilltop castle with mysterious underground tunnels?

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...1. Austria 2. France 3. Poland 4. Czechia

Step 2 : Answer to the question "Where is this hilltop castle with mysterious underground tunnels?"

Poland - Nicknamed the “Pearl of Lower Silesia,” the 13th-century Książ Castle lies at the foothills of Wałbrzyski in Poland. Once home to the noble House of Hochberg, the castle was seized by the Nazis during World War II, when Count Hans Heinrich XVII of Hochberg escaped to England and became a British citizen. The Germans occupied the home, destroying many historic chambers and building tunnels beneath the castle. The function of the castle is still a mystery to historians even today. Following rampant looting during and after the war, the estate and its grounds were restored and are now open to the public — including those mysterious underground tunnels.:

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