Man touching a wall with gun shot wholes of an abandoned hospital in the mountains of Sljeme, Zagreb, Croatia

backpack urbex people graffiti dark tourism urban explorer urban exploring man touching wall urbex psychiatric hospital wall post apocalyptic ruin person second world war tuberculosis abandoned building world war 2 world war zagreb first world war abandoned decay sanatorium brestovac forgotten abandoned hospital hospital clinic sljeme man building medical facility europe historical landmark historical gun shots exterior landmark croatia gun shot wholes middle aged touch hospital building wholes touching sljieme male architecture forest