NPR's Daily Picture Show Narrated Slideshow: To Stephen Alvarez, the underworld is a desirable destination. The vast, uncharted underworld of caves, that is. From the June issue of National Geographic magazine, he takes us with him on a subterranean journey through some of the most majestic cave systems in the American Southeast. Explore this underworld with audio narration by the photographer himself.
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NPR's Daily Picture Show

Read more about Alvarez on NPR's photoblog