Semín is an intriguing Celtic archaeological site, located on a plateau above the Podtrosecká valley. A reconstruction of a Celtic oppidum fort occupies part of the plateau today.
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An 11 km circular walk from Trosky through two scenic Český ráj valleys
A super circular 11km walk starting and finishing at the iconic Trosky castle, which explores the scenic Podtrosecká and Žehrovky valleys, along the shores of several small lakes
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