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For twelve years, I went to Bezdružicka in the summer with a comma in my hand and mapped the mysterious underground passage between the castles of Gutštejn, Falkenštejn, Krasíkov, Bezdružice, as well as Kozí vrch, Špičák, Ovčí vrch, Tepla and Šipín. What I found out is in the movie. I believe that it could have been built by the Lucans or someone else earlier.