Severe drought, torrential rain, extreme cold and unpredictable winds are among nature's most powerful forces. Those extreme conditions have also created dramatic turning points in history. Evidence from historic battles and lost civilizations shows how underestimating or incorrectly predicting the weather has often had unexpected consequences. How did an iceberg cause the Titanic to sink? When did bad weather save the U.S. Capitol? How and when did weather and natural forces wage war directly on entire populations - sometimes erasing them completely? "Weather That Changed The World", through past extreme weather footage, reconstructions and surprise insight from experts, reveals how the history of the world has been defined by weather and how weather-shaped events impact us today.