In fact, there are fossils that indicate that there were signs of aliens. Some fossils were dug up and people thought they were normal egyptians. However, some of their heads were larger and the eyes and nose were much too large, which shows that there was some type of mutation that increased the size of their brains and directly affected their intellect. Fermi’s Paradox is the beginning of new questions to many unexplained phenomena.
Currently in the world, there is no way to explain any of these anomalies, however by assuming that aliens did come and visit us, many of the events make sense. The Egyptians may have used alien technology to move or lift the blocks. As for the crops, the aliens may have wanted to leave a mark on the Earth before leaving. The odd shaped skulls can be the skulls of mutated human beings or some of the aliens