The most amazing tunnels in the world

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Republic of China (Taiwan) - The 700-m (2,296-ft) Beihai Tunnel runs from the Tieban coast into channels carved underneath Nangan. Pleasure boat rides ply its crystal-clear waters.

 

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India - Glowing under warm illumination, the Revoli Tunnel at Lower Bazaar is an underground passageway located in the heart of Shimla, a bustling city in the country's Himachal Pradesh state.

 

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Vietnam - Not for the claustrophobic, the Cu Chi tunnel complex in Ho Chi Minh City offers a fascinating glimpse into the way Viet Cong forces operated below ground during the Vietnam War.

 

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USA -

The deserted and spooky halls and tunnels of the former Eastern State Penitentiary in Philadelphia, Pennsylvania.