Entrance to a abandoned gallery of Cashier mine, morning. Death Valley National Park, California, USA. http://www.terragalleria.com/parks/np-image.deva32589.html Shaft of La Valenciana mine. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32404.html Ice tunnel leading to the ridge exiting Aiguille du Midi. Alps, France http://www.terragalleria.com/mountain/mountain-image.alps3526.html Road tunnel in pink limestone cliff. Utah, USA http://www.terragalleria.com/america/utah/zion-area/picture.usut45250.html Access tunnel to Furnace Creek Inn by night. Death Valley National Park, California, USA. http://www.terragalleria.com/parks/np-image.deva32615.html Houses on a hillside built above a tunnel. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32331.html Entrance of one of the subterranean streets with a house built above. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32461.html Gallery of Cashier mine, morning. Death Valley National Park, California, USA. http://www.terragalleria.com/parks/np-image.deva32590.html Juarez street and subterranean street with bus at night. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32352.html Subtarranean passageway with street and sidewalk. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32425.html Women walking in a tunnel. Guanajuato, Mexico http://www.terragalleria.com/north-america/mexico/guanajuato/picture.mexi32377.html