In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries Colorado River water to Southern California.

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 ...

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 ...

The tunnel-and-garage combo has sent some Salzberg ... “I think what amazes people is that a private individual can dig into the mountain,” Green Party official Ingeborg Haller, who is leading ...

Stumphouse Tunnel is an unfinished railroad tunnel in Stumphouse Mountain Park, Oconee County, South Carolina. If you love quirky, offbeat attractions (like I do!), it’s definitely worth the ...

The 13-mile-long San Jacinto Tunnel was bored through the mountain in the 1930s by a crew of about 1,200 men who worked day and night for six years, blasting rock and digging with machinery.

Scott Reierson, an operations and maintenance supervisor for the Metropolitan Water District, leads a group on a tour, walking through a 16-foot-diameter tunnel toward the west portal of the ...