Join a team of explorers as they descend into the depths of Arizona’s Kartchner Caverns. Discover how the slow dripping of water built this cave over time and why researchers say the cave is “alive.”
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Photographs: © Jose Fuste Raga/Corbis (fortress); © Keren Su/China Span (Great Wall); © Angelo Cavalli/Getty Images (Li River); © Ryan Pyle/Corbis (woman)
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