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highway tunnel in the mountain river canyon - Cache la Poudre River at Little Narrows above Fort Collins in northern Colorado, early spring scenery Stock Photo - Alamy
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India, Himachal Pradesh, Kinnaur, road tunnel cut in rock overhang of River Sutlej gorge Stock Photo - Alamy
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![Davi's Falls The water forms an underground tunnel after reaching the bottom. This tunnel is approximately 500 feet (150 m) long and runs 100 feet (30 m) below ground level.After exiting the Davi's Falls The water forms an underground tunnel after reaching the bottom. This tunnel is approximately 500 feet (150 m) long and runs 100 feet (30 m) below ground level.After exiting the](https://media-cdn.tripadvisor.com/media/photo-s/16/68/01/92/tibetan-village.jpg)