When the 1.1-mile-long Zion-Mount Carmel Tunnel was completed in 1930, it was the longest non-urban highway tunnel anywhere in the United States. Five galleries were carved into the sides of the mountain along the road through the tunnel to provide places to stop and view the scenery of Zion National Park. (Ashay Manjure/flickr.com)
[The World's 20 Most Amazing Tunnels]Western Wall Tunnel, Israel
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[The World's 20 Most Amazing Tunnels]North Korean Infiltration Tunnels, DMZ
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