Roles changed quickly in Europe last week. Patriots became traitors and exiles, exponents of recently suppressed ideologies became the men of the hour. France at war became France at peace, and conquerors became sightseers.
Foremost sightseer was a little man in a light brown duster who slipped practically unnoticed into the Hotel des Invalides in Paris. Adolf Hitler gazed down at the tomb of Napoleon Bonaparte, another "Little Corporal" whose star had soared to a zenith equaled only by his own before it sputtered and plunged.
Accompanied by a staff of art historians and architectural experts, the Führer visited the Opera, strolled...