A submerged pyramid near the islands of Rio, Kios in Japan, known as the Yonagouni monument, continues to worry about researchers from its discovery in 1986. Located 25 meters below sea level and has sharp steps, and is 27 meters high and seems to be a height of 27 meters. However, tests show that the stone is over 10,000 years old, suggesting that it could have been constructed before the area sinks under water more than 12,000 years ago, placing its origin long before other known ancient structures.

If it had been built by a developed culture, the Yonagouni monument could change the course of history, as it would mean that it was created before the Egyptian pyramids and Stonehenge. Some have called it “Atlantis of Japan”. However, skepticists, such as archaeologist Flint Dubl, argue that the structure is a natural geological form, despite the contradictions of researcher Graham Hancock, who contradicts other human constructions, carrying similar characteristics, such as arches and terraces.

This debate includes other ancient sites, such as Giompecki Tepe in Turkey, dating back to more than 12,000 years ago and questioning the traditional perception of the potential of ancient people. Another space, Gunng Pantang in Indonesia, may be much older, putting its own stone in the mystery of lost cultures.

While the origin of the Yonagouni monument remains uncertain, it stands as a symbol of the constant enigma around ancient cultures, possibly overturning the story if further elements are found to support the theory that it is artificial.