So it's no surprise that millions of visitors come to the southern Chinese city of Guilin to revel in the neon wonders of this 787-foot-long river-carved limestone cavern.

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Reed Flute Cave

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Guilin, China

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7 of the Coolest Caves You Can Visit Around the World

With its stalactites and stalagmites awash in a rainbow of hallucinogenic lighting, you could almost mistake this otherworldly cave for an outsized psychedelic aquarium.

So it's no surprise that millions of visitors come to the southern Chinese city of Guilin to revel in the neon wonders of this 787-foot-long river-carved limestone cavern. Perhaps more surprising, though, is that the cave's discovery was relatively recent: It was a search for shelter from Japanese attacks during World War II that resurfaced the Reed Flute Cave to the modern world. Evidence suggests that people have been seeking refuge of some kind or another here since well before the 1940s — there are inscriptions inside that date back to the Tang Dynasty (618 to 906 CE). Of course, in cave time, that's basically a minute ago: The presumed age of the site is somewhere in the neighborhood of 180 million years.

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