Maybe that's because it's also one of the world's steepest roads, chiseled into the mountain by local villagers. The Guoliang Tunnel is located in the Taihang Mountains in China's Henan Province ...

Below Detroit's streets is a network of tunnel systems almost as elaborate ... From the salt mines used to launch the city into economic prosperity at the start of the 20th century to the remnants ...

Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.

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But none were quite as formidable as the snowy granite mountain range rising east ... Drifts clogged the entrance to every tunnel, turning many workers into full-time shovelers.

The Zoji La Tunnel, which is set to be the longest in Asia, will pass under the Zoji La pass in the Himalayas, the world's highest mountain range. The aim of the tunnel is to provide year-round ...

Near the southern end of Skyline Drive, considered Virginia's best fall drive, the Blue Ridge Tunnel is a 4,273-foot-long passage that traverses Afton Mountain. The tunnel was designed by French ...

Thousands of workers are battling the elements to build India's longest tunnel in the Himalayas. But the Zojila tunnel has a greater purpose, as it could be a game changer for India in the country ...