Traveling across Europe elicits constant double-takes for someone of the baby-boom generation. Just as you are relishing the sights in a lovely city like Prague, Dres­den or Budapest, you are startled to see an object or a historical marker that reminds you how very recently these places be­longed to a sinister political and cultural order.

Is it really just a quarter century ago that nations like Czechoslovakia and East Germany were part of a Soviet empire that threatened to engulf Western Europe? Once upon a time—and not long ago—there was another Europe.

Equally consigned to oblivion, at least for most Americans, is the religious story of communist Europe, in which Christians suffered horrific persecutions. Wan­der­­ing in Hungary today, you will casually see signs with names like Recsk and Kistarcsa, with no warning that in the 1950s these were the sites of lethal concentration camps in which Christian clergy and laity were murdered in the thousands.