The problem I have with “Nephilim” giants, where are the skeletons?
I think the existence of the Nephilim, the giants, can explain certain structures like the Stonehenge and the statues on Easter Island.
It seems that they're no longer around. Jude 1:6 says, "And the angels which kept not their first estate, but left their own habitation, [God] has reserved in everlasting chains under darkness unto the judgment of the great day." This seems to indicate that these mutant fallen angels who somehow changed their form to mate with human women, are permanently bound until the Final Judgment. That could mean we won't see these creatures anymore on earth.
However, in Matt. 24:27, Jesus said, "But as the days of Noah were, so shall also the coming of the Son of man be." This might leave open the possibility that during the Great Tribulation, these creatures could reappear. I wouldn't be surprised.