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In this episode of The Atlas Obscura Podcast, we discover why professional adventurer George Kourounis knew he needed to visit the Cave of the Crystals, located nearly a thousand feet beneath northern Mexico, the moment he saw a photograph from inside the cave.

Our podcast is an audio guide to the world’s wondrous, awe-inspiring, strange places. In under 15 minutes, we’ll take you to an incredible site, and along the way you’ll meet some fascinating people and hear their stories. Join us daily, Monday through Thursday, to explore a new wonder with cofounder Dylan Thuras and a neighborhood of Atlas Obscura reporters.

The giant crystals of Naica Cave.
The giant crystals of Naica Cave. Alexander Van Driessche, CC BY 3.0/Wikimedia