A structure known as the Yonaguni monument or “Japan’s Atlantis” is located underwater in the Yaeyama Islands off the westernmost point of Japan. The tiny island of Yonaguni is difficult to reach but has remained popular due to the discovery of the Yonaguni monument in 1986.
According to CNN
Exactly how the underwater pyramid structure, known as the Yonaguni monument, was formed is still under debate. Some claim the ruins to be evidence of a long lost city, while others are convinced it is a geological phenomenon. There are even a few who believe the site to be the work of architecturally-ambitious aliens. Whatever its origin, it’s an impressive site. Estimated to be between 5,000 and 8,000 years old, the stepped structures — with smooth platform steps and right angles — appear as though they were carved out of the rock.”
The structure is believed by Masaaki Kimura, a marine geologist at the University of the Ryukyus in Japan who has been diving at the site to measure and map its formations for more than 15 years, to be a city that is 5,000 years old that submerged into the sea by an earthquake around 2,000 years ago. It seems that the structures are in fact made by man, but what do you think?