Nevděk

Nevděk is a ruined castle on the hill of the same name near the town of Žlutice in the Karlovy Vary Region. Its remains are protected as a cultural monument. It was founded by the Hussite leader Jakoubek of Vřesovice before the mid-fifteenth century, and it likely fell into disrepair during the following century.

Description source: Wikipedia, CC BY-SA licence — wikipedia.org