Currently, the Mammoth Cave located in United States, in Kentucky, is considered to be the longest and most branched cave in the world. The general length of the examined passages of the Mammoth Cave is about 627 km. Some of their junctions have the depth of 115 meters. The cave structure is incredibly complicated, it contains more than 200 passages, as well as dozens of deep pits and halls of impressive size. It is remarkable that the being discovered in 1797 it is still not fully excavated. According to versions of researching scientists, it was formed more than 10 million years ago.
The researchers from the 18th century were not the first people to have discovered the cave. The local Indians used this place for funerals. During the research of the hollow halls, several mummies, as well as rock drawings were discovered. The Mammoth Cave is quite dry compared to other caves. Therefore, there are no stalactites and stalagmites here inside.
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