If you study Gobekli Tepe, which was the first civilization created over 12,000 years ago, then study the migration of people, genes, and culture that began to spread throughout the world when Gobekli Tepe was abandoned 10,000 years ago, you can see who the Nephilim were.
There is much evidence in the archaeological record which shows that Neanderthals were cannibalistic hunters. They were killing large animals with sharpened sticks 400,000 years ago in Northern Europe. The first Homo Sapiens to exit Africa met and interacted with Neanderthals, and inherited genes and behavior from Neanderthals. The inherited behavior of Neanderthals is what gives us the Biblical story of Cain and Abel. Also, the story of Jacob and Esau is based on the divergent behavior of Neanderthal hunters versus Homo Sapiens farmer/shepherds. Even though the Neanderthals were effectively extinct at that point in time, some of their behavioral traits (as well as phenotypical traits) continue to exist to this day in genes which people inherited from Neanderthals.
The story of the Nephilim certainly fits the archaeological evidence which exists at the ancient archaeological site of Gobekli Tepe. At the time that Gobekli Tepe was abandoned, farmers and shepherds from Anatolia began to spread across Europe. At the same time, Gobekli Tepe began to be systematically filled in with soil and the bones of animals and humans. Disarticulated skeletons, broken skulls, carved skulls, and drilled skulls reveal evidence that Gobekli Tepe was abandoned as a result of an invasion of cannibalistic people. This would have occurred 10,000 years ago, and coincided with the time that the mammoth became extinct in Eurasia. It also coincides with the beginning of the Y-chromosome bottle neck, a time of male genocide that lasted 5,000 years.
Aggressive, homicidal behavior began to spread throughout the world from these early cannibalistic people. 8,000 years ago Çatalhöyük was abandoned as a result of increased interpersonal violence. Just prior to the fall of Çatalhöyük, the people of this ancient civilization began to sculpt images of giants (massive, rotund, obese women, or perhaps the same woman in more than one sculpture, the seated woman of Çatalhöyük is one of two sculptures of a giantess which were found at Çatalhöyük). So there is certainly archaeological evidence of giant cannibalistic people who invaded farming communities, monopolizing women (the sons of gods came into the daughters of men and they bore children), and demanding to be fed. The invaders had inherited genes, behavior, physical traits, and culture of Neanderthals. This behavior spread across Europe with the Linearbandkeramik culture 7,000 years ago, and spread to the Island of Malta and into Southeastern Europe 6,000 years ago. This is when a death cult of Malta began burying their dead with rich grave goods, weapons, red ocher, and sculpted images of giant, obese people. It is also the time that the Late Chalcolithic Cultural Collapse occurred in Southeastern Europe, which was a time of significant cultural change and genetic replacement.
It would be 5,000 years after the abandonment of Gobekli Tepe that the story of Cain and Abel came to be told. It was Anatolian farmers and shepherds that constructed Stonehenge. The Iberian Peninsula is named for these early Europe farmers, and Ireland was originally named Iberion and Hibernia for these people, the Iberu, Hiberu, the Hebrews. At the time that Stonehenge was completed the Anatolian farmers (Hebrews) began to vanish from the Iberian Peninsula and the British Isles. They were replaced by people who carried genes that had migrated out of the Eurasian Steppe, Yamnaya and Bell Beaker people (Maritime Culture, Phoenicians). At this time the Egyptians began constructing the pyramids of Giza. This is when the Hebrews became the slaves of Egypt. This is also the time that the Hebrews began telling the story of Cain and Abel. Cain was a Canaanite farmer, one of many Eurasians that had immigrated into the Near East, North Africa, and eventually into Europe. The mark that Cain carried, the “Mark of Cain”, was the symbol of the triskelion, a three legged swastika that the Canaanite Phoenicians spread throughout the Mediterranean (and eventually into Central Asia, Pakistan, and India). The triskelion has three curved legs which make it look like three connected sixes, “666”, the mark of the beast. This symbol is seen at Newgrange passage tomb in Ireland, and in the Snake Witch Stone in Sweden, it is the Valknut (three connected triangles or pyramids) of ancient Germans and Vikings. It is one symbol related to the swastika that was spread along with cannibalism, genocide, warfare, slavery, oppression, social stratification, inherited nobility, monarchy, tyranny, an interest in destructive weapons, and a destructive behavior that has always followed people who have inherited genes of cannibalistic Neanderthals.