Subterranean River National Park. If you’re not scared of dark, tight spaces, then book a trip to Puerto Princesa, Palawan to see the Subterranean River National Park. It is the longest subterranean ... more 
Subterranean River National Park. If you’re not scared of dark, tight spaces, then book a trip to Puerto Princesa, Palawan to see the Subterranean River National Park. It is the longest subterranean river in the world, running about 8.2 kilometers—and it’s also one of the rare rivers that flow out into the sea from an inland source. less 
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| Photo By Harvey Tapan
Thu, Mar 28, 2013 1:00 AM EDT