In a time when people believed flying was impossible, Joseph and Etienne Montgolfier proved that the sky wasn't the limit. When most thought horseback was the only way to race, Bertha and Karl Benz fired up their engines. From the invention of the bicycle and the passenger steam locomotive to the first liquid-fuel propelled rocket and industrial robot, inventors across the world have redefined travel. Informative and celebratory, this collective biography tells the story of the experiments, failures, and successes of visionaries who changed the way the world moves.