As far as hidden gems go, Emerald Cave certainly qualifies. It’s a small grotto carved from the rocky walls of a canyon on the Colorado River in northwestern Arizona that can only be reached by a boat ...

While Arizona is famous for its stunning landscapes and dramatic rock formations, some of the best things to see here are underground. Arizona has numerous famous caves — some readily open to the ...

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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.