The ruins of Greifenstein Castle are perched on a rugged rock above the first helical tunnel of the Rhaetian Railway above Filisur at 1,246 m above sea level.
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If you are in Chur and want to go south, you traditionally have to make a decision at the Obertor: From here, the so-called Untere Strasse leads via Thusis to the Splügen and San Bernardino passes.
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