There is no surer way to feel the danger or the good fortune of our collective past than to contemplate those moments when the world's future hung in the balance. Our brightest historians speculate on some of these intriguing crossroads and the ways in which our lives might have been changed for the better -- or the worse.

These unabridged essays range across the full span of history. Geoffrey Parker describes ramifications that might have included a divided Reformation movement, a strengthened Catholic leadership, and no European settlements in the Americas. And Caleb Carr argues that we could have been spared the horrific last six months of World War II in Europe if Eisenhower had seized his chance to destroy the Nazis in the fall of 1944.

This all-star list of award-winning and bestselling authors includes Lance Morrow, Andrew Roberts, Cecelia Holland, Theodore F. Cook and others.