Pushing the button that's marked is a human tendency, and we can't help it. It's like a reflex that pushes us over the edge and makes us want to know more about it. Some places are unreachable because of natural conditions, but there are also some places that are protected from human reach. And that makes us wonder, what's going on behind the closed doors at the top of the mountain?
So, we at The Popple have compiled a list of the most guarded places on Earth!
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