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Old narrow underground passage 1419979417

old narrow underground passage

Air raid shelter of World War II, old tunnel dug into the tufa rock where people took refuge during the bombings 1415411872

air raid shelter of

tunel 497544633

tunel

Rock Tunnel on Sylvan Lake Trails in Custer State Park, Black Hills Country, South Dakota, USA 2158545371

rock tunnel on sylvan

Danger winter mountain road surrounded by icicles goes into the narrow tunnel. Berchtesgaden national park, Germany 1182693997

danger winter mountain road

View through a round concrete tunnel carrying a stream beneath a road 1496022655

view through a round

Cu chi tunnels history in Vietnam. Cu Chi tunnel built by vietnamese guerilla forces during Vietnam war, 60 km from Ho Chi Minh City, 1147567033

cu chi tunnels history

Country road by Lærdalselva, Lærdal Vestland  Norway 2172378622

country road by lærdalselva

Narrow asphalt road winding into a dark tunnel beneath an ancient stone bridge, its surface adorned with lush, green ivy 2226356533

narrow asphalt road winding

Refuge of Terni 2149317020

refuge of terni

close up 916075850

close up

Hope 178953038

hope