Hidden canyons, glowing caves and alien plateaus quietly outshine icons, proving Earth still keeps its wildest wonders yet ...

The legend of a Grand Canyon ranger stumbling onto a hidden chamber packed with Egyptian relics has all the ingredients of a ...

Emerald Cave, a small grotto on the Colorado River, is accessible by kayak, canoe or paddleboard. The cave's green shimmer is caused by sunlight reflecting off the canyon walls and underwater algae.