view of jamska cesta near postojna cave entrance at nice winter day slovenia

architecture beautiful bright building cave day destination entrance holidays jama karst mountain nice outdoor postojna postojnska sightseeing slovenia snow system travel trip trips underworld vacations view white winter tourists environment geology attraction attractive europe landmark landscape visiting country top tourist february site season traditional tourism sunny tour excursion group underground scenery nature natural vacation pivka river planina valley cold weather jamska cecta kilometres merges cesta 913 road day february transport transportation village slovenian europe european