: Microscopic copper, tungsten, and molybdenum coils found in the Ural Mountains at depths of over 30 feet, which some argue resemble modern manufactured technology.

: You can find full episodes on the official History Channel site or via platforms like Apple TV and Philo . Review of Ancient Aliens S16E07 "Impossible Artifacts"

: A well-crafted blade made from iron with high nickel content, confirmed to be of meteoric origin, which theorists suggest was beyond the manufacturing capabilities of New Kingdom Egyptians.

: The episode discusses the modern "Lunar Library" sent to the moon by the Arch Mission Foundation using SpaceX, drawing parallels to the idea that ancient artifacts could contain encrypted synthetic DNA messages.

: A heavy metal object found 30 feet underground in Transylvania in 1974. It contains a high percentage of aluminum, which was not industrially produced until the 19th century.

: Giorgio Tsoukalos, David Childress, and Michio Kaku .

: A 19th-century hammer head discovered in 1936 in London, Texas, encased in rock that proponents claim is 140 million years old.