World War II was in its early days when brutal German dictator Adolf Hitler paid a visit to Paris, the capital of France. Only days before, on June 14, 1940, German soldiers had overrun the city, shocking the world. Hitler now viewed the city's cultural treasures as his own. He posed for a photo in front of the Eiffel Tower, the beloved symbol of France and the country's free, democratic people. The photo, taken by his personal photographer, Heinrich Hoffmann, would show the world that Nazi Germany had triumphed over its bitter enemy. Many who viewed the photo in newspapers around the globe would draw a second conclusion that Germany would almost certainly invade Britain next. And if Britain fell, Hitler would be a huge step closer to his ultimate goal of world domination.

Noted historian and award-winning author Don Nardo has written many books for young people about American history. Nardo lives with his wife, Christine, in Massachusetts.