There's An Underground Kingdom In A Cave In Vietnam That Nobody's Ever Heard OfWhat one local Vietnamese man found in the 90s turned out to be the entrance to a massive cave. No one realized he'd stumbled into the world's largest.
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A Cave Was Sealed for Five Million Years and These Are the Bizarre Animals They Found Inside
In 1986, workers in communist Romania were examining the area around a barren plain near the Black Sea and Bulgarian border to see if the land could sustain a power plant. But what they wound up finding was unlike anything the world had ever seen.