A souvenir print of London’s Thames Tunnel, which opened in 1843. Pictures: Alamy

Seven of the world’s best tunnel tours: explore the underground offerings of Argentina to Vietnam

From ‘coal mines’ beneath the Korean DMZ to the Viet Cong’s extensive network near Ho Chi Minh City, these subterranean must-sees reveal more about a destination’s history, or provide a useful way of getting there

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A souvenir print of London’s Thames Tunnel, which opened in 1843. Pictures: Alamy
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