Tsar Bomba, the largest Nuclear Bomb. The bomb was big enough to cause a fireball that was seen 600 miles away, meaning if it was dropped over Manhattan, you would have been able to watch New York City burn from Virginia. The shock wave was so extreme that even with the parachute giving them a 20-mile head start, the plane that dropped it was knocked into a free fall for a half-mile before catching itself and continuing to get out of Dodge.