Best Tunnels
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The Gibraltar Tunnels comprise an extensive network of underground passages carved into the Rock of Gibraltar, the majority excavated during World War II by the British Army's Royal Engineers and Canadian tunnellers. The network, which expanded significantly on earlier 18th-century siege tunnels, ho...
The Vinh Moc Tunnels are an underground coastal complex situated in Quảng Trị Province, Vietnam, constructed to protect civilians from heavy American bombing campaigns during the Vietnam War. Unlike the military-focused Củ Chi tunnels, the Vinh Moc complex functioned as an entire subterranean villag...
The Vimy Ridge Underground is a network of subterranean tunnels near Vimy, France, prepared by British and Canadian engineers before the Battle of Vimy Ridge in April 1917. These tunnels, including the Grange Subway, allowed troops to move to the front lines protected from enemy fire and housed comm...
The Rabaul Japanese Tunnels are an extensive network of underground passages located beneath the town of Rabaul in Papua New Guinea. Constructed by Japanese forces using Allied prisoners of war and local civilian labor during World War II, the tunnels were intended to shelter troops, munitions, and...
The Hill 60 Bunkers near Ypres, Belgium, are heavily contested German and British concrete fortifications built on a strategic spoil heap during World War I.
The Aar Massif is a major geological crystalline basement formation and mountain range located in the Bernese Alps of Switzerland. It is primarily composed of granitic rocks that were formed during the Variscan orogeny and later uplifted during the Alpine orogeny. The massif contains the Finsteraarh...
Beijing Underground City is a Cold War tunnel network built from 1969 to 1979 under China's capital as a shelter against possible Soviet attack.
The Kumchang-ri Underground Facility in North Korea is a vast, highly secretive subterranean complex long suspected by international monitors of housing nuclear weapons work.
