Japan's Seikan Tunnel was built to provide a safer way to cross the dangerous Tsugaru Strait between the islands of Honshu and Hokkaido, a place where typhoon winds frequently lash the coastline. A 1954 storm in the strait sank several ferry boats, killing more than 1,400 people. (Wikimedia Commons)
[The World's 20 Most Amazing Tunnels]Large Hadron Collider, France/Switzerland
[The World's 20 Most Amazing Tunnels]Tunnel of Nine Turns, Taiwan
[The World's 20 Most Amazing Tunnels]Cu Chi Tunnels, Vietnam
[The World's 20 Most Amazing Tunnels] Sequoia National Park Tree Tunnels, United States
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