This hole resembling like the mouth of hell may look dangerous at first glance, but everything is so perfect about it. Still you may wonder about the waters disappearing in the hole. Calm down! There is no ghost family residing over there.
While the reason for the mysterious double waterfalls in Minnesota is shocking, this famous hole has also surprised the people all over the world. This beautiful place discovered recently is the dam of the Conchos situated in the Serra da Estrela, Portugal. The mysterious hole is actually a part of the hydroelectric system.
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