Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...

rehabilitate and upgrade the 19-mile-long Mountain Tunnel, a key component of the Hetch Hetchy Water System that takes water from Tuolumne County and sends it to San Francisco. The San Francisco ...

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 ...

You might think the far-fetched idea of twin tunnels whisking Tesla passengers from downtown to the beach might be dead. You ...

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 ...

Special to The New York Times. TimesMachine is an exclusive benefit for home delivery and digital subscribers. Full text is unavailable for this digitized archive article. Subscribers may view the ...

When it opened on July 4, 1930, it was the longest mountain tunnel in the U.S. Today, the sandstone tunnel is a major thoroughfare and top Zion National Park attraction. As you drive through it ...

The Gotthard Base Tunnel, stretching an extraordinary 57 kilometres (35 miles) under the Swiss Alps, stands as the longest and deepest traffic tunnel in the world. Completed in 2016 at a cost of ...