Underwater mysteries fascinate with their dark depths and hidden anomalies. When an ancient city was found off Cuba, extremely deep in the sea, its sheer presence called into question what we thought we knew about the land and oceans in human prehistory. Could the land upon which it stood have once been dry, even though it now sits fathoms below the surface of the ocean? What about the seemingly man-made wall, stretching for a mile?

Source: When Ancient Masters Ruled the Earth: The Mysterious Depths of the Saint Croix Basin | Ancient Origins