Built by the European Organization for Nuclear Research, the Large Hadron Collider lies in a 17-mile-long tunnel about 570 feet underground near Geneva, Switzerland. It recreates the conditions just after the Big Bang to allow scientists to study the smallest known particles in the universe. (CERN/PA Archive)
[The World's 20 Most Amazing Tunnels]Yerba Buena Island Tunnel, United States
[The World's 20 Most Amazing Tunnels]Hezekiah's Tunnel, Israel
[The World's 20 Most Amazing Tunnels]Tunnel of Nine Turns, Taiwan
[The World's 20 Most Amazing Tunnels]Seikan Tunnel, Japan
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