Kozlov
Ruins · Czechia
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Reached by a short climb above the hamlet of Košov, Kozlov's overgrown earthworks hide one of the region's odder relics: a passage cut straight into the melaphyre bedrock that drops through an artificial shaft over 11 metres deep, a cistern, an escape route, or a later treasure-hunters' dig, nobody is sure which. It was built as a curtain-wall castle in the first half of the 14th century, its whole defence resting on one massive perimeter wall rather than a tower, contemporary with the nearby castles of Kumburk and Bradlec. The only reliable written record, from 1462, names Aleš ze Šanova as lord of the Lomnice estate that included it, and by then Kozlov itself was already listed as deserted, so it stood barely a century. Today just wall fragments, a rock-cut cistern, and the double ditches that once guarded its exposed southern flank remain, protected as a cultural monument since 1964.
From Wikipedia
Kozlov je zřícenina hradu jihovýchodně od Košova u Lomnice nad Popelkou v okrese Semily. Stojí na stejnojmenném vrchu s melafyrovými výchozy v Ještědsko-kozákovském hřbetu. Hrad byl založen ve čtrnáctém století a ve druhé polovině patnáctého století byl již pustý. Dochovaly se z něj terénní relikty opevnění a fragmenty obvodové hradby. Pozůstatky hradu jsou od roku 1964 chráněné jako kulturní památka.