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 ...
Knewz on MSN1d
Archeologists Put an End to a Centuries-Old Rumor, Confirm the Existence of Underground Tunnel System Beneath Cusco
Archeologists Put an End to a Centuries-Old Rumor, Confirm the Existence of Underground Tunnel System Beneath Cusco ...
Smithsonian Magazine on MSN5d
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 ...
As the border wall goes up, the underground threat will grow
John Spencer is chair of urban warfare studies at the Modern War Institute and a founding member of the International Working ...
Da Vinci was right: Secret tunnels found in Italian castle
Italy's Sforza Castle includes a underground passage that linked the Duke of Milan to his wife’s tomb.
Underground tunnel tours set for February
The system was created to allow freight to be moved without disrupting traffic but soon came to be used by local oilmen and ...
The Independent5d
Hidden underground tunnel system built by Incas found beneath Cusco
After centuries of speculation, archaeologists in Peru have confirmed the existence of an underground tunnel network, thought to have been built by the Incas. The groundbreaking discovery was ...
Archaeologists Discovered An Underground Inca Labyrinth, Confirming a Centuries-Old Rumor
The Incan Temple of the Sun in Cusco has long been a visual and cultural jewel of the ancient empire. But there’s even more ...
Cincinnati's abandoned subway tunnels: Here are some of the ideas to revive them
Cincinnati asked architects and designers to submit ideas to repurpose the city's abandoned subway tunnel system. The ...