For thousands of years, humans and their actions have shaped our history. But some people have such a profound and at times devastating influence, they not only change the course of history, they also manage to leave a legacy so powerful, it can be called world-changing. This book looks at 10 of these people - from discoverer Christopher Columbus who brought about a radical change to the face of the American continents, to Osama bin Laden who masterminded the devastating attacks of 9/11, which ushered in a new era of warfare and terrorism.