I think there’s actually a few thousand more caves, but nevertheless, theSlovenian underground is gorgeous 
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Explore Slovenia's Spectacular River Caves
Home to a staggering 8,000 caves—including 20 designated as "show caves"—Slovenia ranks among the world's premiere caving destinations. http://on.natgeo.com/2kqUhDM
Posted by National Geographic Adventure on Thursday, December 14, 2017
