Completed in 1936, the Yerba Buena Tunnel connects the two stretches of the San Francisco-Oakland Bay Bridge. With a diameter of about 76 feet, it remains the world's largest single-bore tunnel and carries five lanes of traffic going each way, one over the other. (Almoronth/Wikimedia Commons)
[The World's 20 Most Amazing Tunnels]Jungfraujoch, Switzerland
[The World's 20 Most Amazing Tunnels]Guoliang Tunnel Road, China
[The World's 20 Most Amazing Tunnels]Hezekiah's Tunnel, Israel
[The World's 20 Most Amazing Tunnels]Large Hadron Collider, France/Switzerland
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