Tsar Bomba
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Tsar Bomba was the largest, most powerful nuclear weapon ever used. It was originally tested by the Soviet Union on October 30, 1961. It was a three stage H bomb.
This bomb is also called the Father of Bombs. Two were built, one real while the other was a fake, meant to distract attention.[source?] See footage of the explosion here
The explosion had a power of 56.000.000 tonns of TNT (56 Megatonns). The Tsar Bomb was actually desined as a 100 Megaton-Bomb. But as there were problems to detonate a bomb as strong as 100,000,000 tonns of TNT, so the Soviet Union techniques reduced its power to 56 Megatonns.