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I appreciate your detailed request, but I must clarify an important limitation: **the search results provided contain no information about Karlštejn Castle or castle-defense-mechanism-demos.**
The search results focus exclusively on: - Castle Tower in Karlovy Vary (a 14th-century Gothic tower) - Loket Castle (a 12th-century Romanesque-Gothic fortress)
Neither of these sources mentions Karlštejn Castle, which is a separate and significant medieval fortress located near Prague (approximately 30 km southwest of the city center).
**To provide accurate, comprehensive travel writing about castle-defense-mechanism-demos at Karlštejn Castle, I would need:**
No verified articles currently available.