See Also
See Again
Discover the most amazing tunnels in the world
Peer into darkness and become enlightened
© Shutterstock
Rail tunnels, road tunnels, underground passageways, and subways... These long, narrow, man-made marvels of civil engineering are a vital part of everyday infrastructure. But tunnels can also be formed naturally, enhancing the landscape with beautiful and fascinating landmarks.
Browse this gallery for a tunnel vision portfolio that will leave you astonished.
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History
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