The Yonaguni Monument

These pyramids that lie underwater are fraught with mystery. Experts argue as to whether they are man-made or a naturally occurring phenomenon. If you incline towards the former, then these structures were made during the last ice age, around 10,000 BCE. These pyramids also resemble those found in Mexico and Central America… Strange! But here’s where things get stranger: There are no other underwater structures found in this area. The latter argument claims that the pyramids are a result of basic geology and classic stratigraphy for sandstones, which tend to break along planes and give you these very straight edges, particularly in an area with lots of faults and tectonic activity.