On the surface, Carlsbad Caverns National Park is deceptively normal—but all bets are off once visitors set foot in the elevator, which plunges 75 stories underground. The hollow beneath the surface is part silky darkness, part subterranean hallucination. The snaky, illuminated walkway seems less like a trail and more like a foray across the River Styx and into the underworld. Within more than 14 football fields of this netherworld are hundreds of formations that alternately resemble cakes, soda straws, ocean waves, and the large, leering face of a mountain troll.

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