Secret tunnel found on U.S.-Mexico border to be sealed off
A secret tunnel discovered last week on the U.S.-Mexico border will be sealed by Mexican authorities, an army official in ...
Smithsonian Magazine on MSN15d
Seven Cities in the World Where You Can Ride an Aerial Cable Car
Urban planners from Mexico City to Toulouse are adopting the high-flying mode of transit. Will it catch on elsewhere?
Smithsonian Magazine on MSN9d
Researchers Have Found an Inca Tunnel Beneath the Peruvian City of Cusco
It’s long been rumored that a network of old, underground tunnels lies beneath Cusco, Peru, the capital of the ancient Incan ...
Cincinnati's abandoned subway tunnels: What's next for the 18 submitted ideas
The city gathered ideas from area architects on how to reimagine Cincinnati's subway system. But it's not clear what's next ...
OKC created an extensive underground tunnel system in the 1970s, connecting major structures
OKC Mayor Patience Latting described the city's underground Metro Concourse network as "the largest pedestrian tunnel system ...
$20 Trillion Transatlantic Tunnel Would Be 'High Risk' Build
The hypothetical tunnel between the U.S. and the UK has been branded as a "high-risk" project by one of the world's leading megaprojects economists.
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A Unique Tunnel In The Great Smoky Mountains With A Troubled Past Leads To Gorgeous Lake Views
In fact, the Great Smoky Mountain National Park is so well-loved that it is actually the most-visited national park in America ... this abandoned tunnel near Bryson City seems to abruptly end ...
CBS News24d
Congestion pricing maps show which New York roads and tunnels are and are not impacted
NEW YORK -- With congestion pricing now in effect in New York City, many commuters may be asking ... Holland and Hugh L. Carey tunnels on the Hudson River side, and the Queensboro Bridge, Queens ...