I just finished reading an amazing book called The Hiram Key . All it does is rewrite the last 4,000 years of history as we understand it. You will probably be surprised, I certainly was. Read the book and find out. Equally interesting books are the Tomb of God and The Bloodline of the Holy Grail.
History is written by the winners.
What we know, or think we know, often is just a politically slanted rewrite. They did, by accident. In 1956 a B-36 the size of two 747's was landing outside Ft. A crewman slipped when he locked down the live H bomb. It fell, right through the bomb bay doors 3000 feet to the ground.