hornischegg - hiking trail along remains of military trench of first world war on mount hornischegg

war trench shelter dugout battle defense alps hiking pathway trail path frontline battlefield dolomites front hornischegg monte arnese ruins fortress history bunker military fortification carnic bunkers world one highroute trek mountain peak elmo sexten autumn trekking national park val pusteria pustertal hike sesto range alpine mountaineering drei zinnen parco naturale tre cime alto adige landscape dolomiti south tyrol wanderlust summit