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Carlsbad Caverns: How to explore this 250-million-year-old underground world

Carlsbad Caverns in New Mexico is a place of wonder with caves full of dazzling formations and sights like the Painted Grotto ...

Sahara’s Perfect Stone Rings: Mysterious Jabal Arkanū Formation That Took Millions Of Years To Build

Deep in the Libyan Sahara lies Jabal Arkanū, a massive, near-perfect set of stone rings once mistaken for a meteorite impact ...