Hey @tremendospercy another great post my friend!! From my own observations nature seems to abhor both straight lines and right angles. Like yourself I'm no expert but my first though when seeing the Yonaguni monument is that it's manmade! Carved out of a natural formation? yes I can go with that but there certainly seems an element of design within this structure. With regards to Shi-Cheng, like you say if you can forget about such amazing architecture and design after fifty years what hope can we have of having historical records relating to cities that are thousands of years old! Of course they would pass into myth, of course people would think they know better and would tut at their mere mention. Indeed the world we inhabit now may in the distant future exist only within the realms of myth. Imagine the stories they would tell of this present age, nobody would believe them! The sheer beauty of Thonis-Heracleion makes me want to take up diving!! stunning. Great post, so glad I caught this! Thanks for sharing!!