GIANT GEOGLYPHS!?

Some claim we never went to the moon, the earth is dommed, and air travel was just invented. If this be the case, did the ancients build the large geoglyphs to talk to the sky people or was it to communicate safely with the cannibalistic giants? Please let us know what you think. This is a theory that may hold some truth since the book of Enoch states the giants were 450 feet tall. Share so others can give there input!