Son Doong, the world's largest cave passage — big enough to fit a skyscraper — is deep inside a Vietnamese jungle. Exploring the dark caverns, home to beautiful rock formations and a river, takes days ...
LOVELL — Falling 100 feet down into a dark cave is (almost) never a good thing. It is easy to imagine: a mountain lion sprinting after an antelope at 45 mph, both animals cresting a low rise. The ...
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