The Yonaguni Monument: Off the coast of Japan, this submerged rock formation features terraces, steps, and right angles that resemble a stepped pyramid or plaza. Discovered in 1986, its origin is hotly debated—whether a man-made structure from a lost civilization or a natural sandstone formation shaped by tectonic activity and erosion. Proponents of artificial origin point to what appear to be carved pathways and megaliths. Skeptical geologists argue that jointing and fracturing in the rock can create such patterns. If man-made, it would date back over 10,000 years, challenging mainstream views of early human development in the region.
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