OAKLAND – Traffic was snarled Wednesday afternoon on eastbound Highway 24 after a car caught fire in the Caldecott Tunnel.

At 5,551 feet above sea level, Tunnel Mountain is the shortest peak in the area, but that'll be the last thought on your mind as you gaze at all that open landscape. And this view is just one ...

The Great Smoky Mountains are famous across the United States as an amazing place to get outside and enjoy nature. In fact, ...

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.

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 ...

Wearing a red hard hat and carrying a backpack with an emergency oxygen tank, I’m sweating as I get a rare look at the newest wonder of the world—the 35.4-mile Gotthard Base Tunnel ...