golubac fortress golubacka trvdjava, or goluback grad seen from dunav river.

afternoon architecture castle citypicture current danube destination djerdap downstream dunav europe famous fort fortified fortress gates golubac golubacka golubacki grad historical history iron landmark landmarks landscape main medieval national nature old one park reflection river scenic serbia serbian sightseeing sky stone stronghold summer sunny taken tourism tower town travel tvrdava tvrdjava valley view wall was water well