bird`s nest in the german bunker pzw 780 of the fortified front oder-warthe-bogen

780 1934 1935 19341935 architecture birds bolt breeding broken buildings built bunker city concrete cracked day daylight defence destroyed detail eastwall fortification fortified front german germany hidden hiding historic historical history iron journey line many metal nest nut oderwarthebogen old one panzerwerk plate poland pzw remains rust rusty screw small staropole starpel structure sunny texture tourism town travel travelling view war worldwar