Atlantis: there has actually some very interesting data gathered all along the coasts of Northwest Morroco to southern Spain, in the Canary Islands and the Azores that gives a plethora of evidence about about the presence of one prematurely sophisticate protohistorical civilization which thrived in these regions during the three latest tens thousands of years of the Upper Paleolithic, up from 30,000 BP to 20,000 BP, slowly declining during the Epipaleolithic (20,000 - 10,000 BP) prior vanishing from the surface of the earth after an yet-unclear global cataclysm which seems from having occured around 10,000 BCE: cataclysm enough terrific to make crumble beneath seas what remained of the reportedly-yet-still-controversial now-sunken, low-grounded landmass encompassing a major extent of the North, Middle and South Atlantic up from the highest northward mountains that would later become the Azores, to the southern mountains that will later become the Canaries and St. Helena Island respectively (and eerily befits accounts by Plato about the continent that belies beyond the isle of Atlantis westward of the Pillars of Hercules as being as vast as both ancient Lybia - e.g. all of Northern Africa west of Egypt and northward of sub-Saharan Africa - and Tyrrhenia joined altogether) and might have likely been beforehand progressively immersed beneath the ocean level all along the Last Glaciation Age.
Accounts from the predynastic period in Egypt mentions that while conquerring all of both Lower Egypt, Marmaica, the Djewi lands from the Red Sea and Sinai, as well as Djeset in southern Levant, the Upper Egyptian ruler Narmer/Nemes subjuguated an ethnic group dwelling in the Delta named the Henebaut "Peoples from the Islands Beyond The Sea" . This term became a millenia later synonymic with the native inhabitants of Myceanean Greece and the Aegean Sea during the New Kingdom period who are much implied to be partially the descendants of the older group who refused to recognize Menes's dominion and fled away toward the Aegean Sea; but in Predynastic and Old Kingdom accounts, it is instead implied that the Henebaut encountered by the first historical Pharaoh of the Two-Lands some 5,100 years ago, were the direct descendants of the same mystical semidivine refugees equally named Henebaut, who progressively fled away from their sunken homeland and found solace in the Nile along the related semidivine tribe of Anu (Plato states that both "Ethiopia" e.g. Kush, Punt or the lands down south of Egypt, and Atlantis were kindred yet bitterly rival sistrens; and centuries prior Plato's birth, it is stated by Hesiod that Pegasus, the winged horse borne from the blood of Lybian Medusa fallen in the sea-foam of Poseidon, shared equally the same divine parentage with the mythical demigod-made-Ethiopian-king Chrosoes, first ruler of the Erythraia on the Red Sea. Astronomically wise, the constellation of Pegasus is located on the Atlantic edges of northwest Africa and southwest Europe in direction of the Americas; while Chrosoes constellatory counterpart, Oephicus, is belted by the celestial equator above Central Northeast Africa - the location of the Mountains of the Moons e.g. Mounts Rwenzori wherein the Anu race has first been sired, as well as the sources of the Nile that nurtures the heartland of Punt - and rises up toward north and east, respectively the Nile and the Horn of Africa. Let's not forget that various marine gods from the deep (Poseidon, Proteus, Nemmeus, Triton) and fallen mountain-gods (the titans Atlas and Prometheus, the Olympian forger Hephaistos/Vulcan) are frequently said from having fathered both the Atlanteans and various Lybian, Egyptian, Ethiopian and Oriental rulers or races in Greek myths) up from the reigns of Osiris to the early years of reign of his son Horus, around 30,000 to 12,000 years before, and later progressively mingled along both the Ethiopian superhuman overrulers and mortal natives sheperded by the House of Kem. In the Osirian myth, the Pillars of Heracles (Detroit of Gilbartar) , derived from the Phoenician hyperbolic geonym for "Pillars of Melqart" (Melqart been a Phoenician counterpart to Horus) are named "Gateways of Nephtys" and thus implies that the Twin Sister of Isis (and subsequently her husband Set, twin brother of Osiris) patroned the Atlantic edges of both Lybia and Hispania/Hibernia/Iberia as well as the Western ocean and its dominions, including the enigmatic realm of Henebaut.
Why Western academics, who were so obsessed about the mythological, philosophical and perhaps historical intricacies of Plato's Atlantis myth, are now so little intrigued at the idea to speak out publicly about the parts of truth and accuracy beyond the legend and fantasy? I simply don't know. Maybe aren't they really comfortable at the idea that some prehistorical groups in and outside of Africa may have (very abnormally) rapidly developped themselves and fell out tens of thousands of years prior the development of agriculture and cuneiform writing in Mesopotamia, all forming complex hierarchized pre-oecumenical societies with levels of sophistication about equal to those highlighted by the Roman Empire or the British Empire at their respective peaks and all of those when the rest of the globe was still living into the Stone Age.
Yonaguni Island: basically another evidence that legends are sometimes marked by some matter of truth.
In this case, we're speaking about the myth of the Dragon King of East Sea and his fabulous sunken city-realm nearby Okinawa in East Asian myths and fables.
Giants... with a big G: we gathered over the past 2,000 years plenty of archeological evidence, both archaic and amateur as well as professional, in various regions of Africa (Rwanda, Tanzania, Botswana, D.R.C. , Sudan, Egypt) , across Eurasia (France, Italy, Thrace/Balkans, the Levant, India, Afghanistan...) , in some Precolumbian tumulus complexes all over the State of Illinois and in Peru about the now-presumedly (near-?) extinct or endangered presence of a very ancient, abnormally sanely triploid (e.g. which has three sets of chromosomes instead of two) hybrid offshoot of Homo Sapiens and some unknown, reproductivelly biocompatible nonhominoid genus, that walked the Earth since as far as the wake of the Upper Paleolithic Culture to the late Bronze Age, prior becoming extinct from the Antiquity to modernally recent times. Whose primary characteristics were their gigantic size varying from around a mean average 8-9 to 12-13 foot tall (with some rarer extremes going till a towering 25 foot tall) for men, and a mean average of 6 to 8 foot tall for women, an unusual humanoid physiology whose build defies theories of environmental adaptation, far-denser-than-average body tissue, muscle tissue and bone structure, an abnormally long neck, extremely elongated, hyperdolicocephalic skulls, an unnatural chemical composure within their bone structure and DNA remains (some of these elements are not even classified within the periodic element table) , DNA structures shifts from double-helicoidal to triple-helicoidal, strong spiritual affinities and beliefs, phenomenal brute strength and superior intellect. Some remains left in the Arizona desert and the U.S. East Coast, as well as Precolumbian myths and urban myths about a troglodytic "Giant of Kandahar" gunned down by the U.S. troops in the Hindu Kush around the late 2000s spoke about "fair" skinned, red-haired misanthropic brutes who went berserk at the littlest intrusive presence of any human within their vicinities or territory, although most of these remains suggests that others Giants may have darker complexions and sophisticate lifestyles, such as the socalled medium-dark skinned "Homo Paracas" from the tumulus found in Peru and the Illinois at the last quarter of the 20th century, and the black-skinned giant found in Rwanda in the 1990s... petrified like in cyrogenic sleep into a gigantic crystal coffin, or other similar coffins of black complexioned, bluish-jetblack and copper reddish brown complexioned akin giants found in the underground labyrinthic complexes underneath Gizah and various parts of Egypt (and held secret) , all presumedly dating back from aeons prior the very founding of the Pharaonic state.
Evidence suggests that the unidentified non-hominioid genus or species who has intermingled in the remote corners of prehistory with Homo Sapiens and begotten this race that defined all of our heroes and demigods of yore, might be not originate from Earth... let alone, from our reality.