[The World's 20 Most Amazing Tunnels]Tunnel of Nine Turns, Taiwan

 

 

 

Carved by the Liwu River into the marble cliffs of Taroko Gorge near Taiwan's eastern coast, the Tunnel of Nine Turns zig-zags along a mile-long stretch of road inside Taroko National Park. Walking tours here offer spectacular views, especially of the waterfalls that spill into the canyon below. (Peilun Hsu/flickr.com)