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Ghosts of past spies haunt London underground tunnels
Behind a blue door in a narrow London passage lies a little-known network of tunnels deep underground, once home to British ...
Archaeologists Followed a Sketch by Leonardo da Vinci. It Led to Secret Tunnels Under an Ancient Castle.
An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to exist. Ground-penetrating radar and laser scanning revealed that the ...
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 ...
History TV1y
Under The Western Front in WW1
A lively portion of WW1 fighting was invisible to the naked eye ... propelled high into the sky and surrounded by flames. If he'd been underground, he would know that a maze of tunnels existed below ...