impregnable medieval marvel of predjama castle predjamski grad has been perched in the middle of 123-metre-high cliff

123metrehigh alp ancient architecture beautiful been castle cave citadel cliff defend europa exterior facade famous fort fortification fortress gothic grad has hill history image impregnable largest legend limestone marvel medieval middle mountain mysterious myth nature old panorama past perched photography postojna predjama predjamski protection renaissance rock royal scenery secret slovenia stone story tale tour tourism tourist tower travel tree wall white world