Watch: Swiss $12 billion rail tunnel, world's longest, opens

Just like Hannibal in ancient times, Swiss engineers have conquered the Alps. More than 2,200 years after the commander from the ancient North African civilization of Carthage led his army of elephants and troops over Europe's highest mountain chain, the Swiss have completed another gargantuan task: Burrowing the world's longest railway tunnel under the Swiss Alps to improve European trade and travel.

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