Top 10 Unexplained Mysterious Structures On The Earth

7. Yonaguni Monument, Japan

The flat parallel faces, sharp edges, the right and precise obtuse angles of the formation would indicate that the monolith was carved by man.

However there still seems to be a huge problem with the Yonaguni monument. How was it built if its underwater, and by whom? Kimura claims that Yonaguni was built over 10,000 years ago, when sea levels where much lower than they are now. During this time, Yonaguni Island would have connected to main land Taiwan, possibly an important trade route for their civilization.