abandoned fortifications of the muravyov-amursky fort on the kholodilnik hill

19th 20th abandoned ancient antique architecture army artillery battery built cannon century citadel concrete defend defense early east end excursion famous far fort fortification fortifications fortress gun heritage hill history kholodilnik landmark landscape military muravyovamursky museum object old part protection ruin russia russian stone strength stronghold tourism tourist travel underground view vladivostok war weapon