Yonaguni Island (Japan) – 14,000 years old
The Yonaguni Monument is a massive underwater rock formation off the coast of Yonaguni, the southernmost of the Ryukyu Islands, in Japan. While many archaeologists and geologists believe that it is a natural formation, some hold the view that some of its features are man-made (being that impossible, would suggest extra terretrial intervention). In 1986, a diver near the island of Yonaguni Jima, off the southern tip of Japan (around Okinawa) came across some strange structures about 25 metres below sea level. They appeared to be stepped structures with terraces and ramps. One of the largest pyramid structures is 600 feet wide and 90 feet high with five separate levels of stone blocks with what appears to be road surrounding the structure.