Nestled deep beneath Norway's rugged mountains is a marvel of modern engineering: the Lærdal Tunnel, the world's longest road tunnel. This impressive 24.5-kilometre (15.2-mile) passage connects ...

I’m sweating as I get a rare look at the newest wonder of the world—the 35.4-mile Gotthard Base Tunnel, the longest tunnel on earth, a $12 billion marvel that took 17 years to dig and will ...