The 16th century castle was used in the Middle Ages by a robber baron because it's hard to conquer. It's located in the inland but is connected, through a cave, to a fertile area kilometers away.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/31817492@N00">inyucho</a> from Holland
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/inyucho/372338846/">Predjama Castle</a>