A pair of slippers awaits visitors at the entrance of a cozy two-room apartment in Berlin's Westend district -- the kind one might expect in one of Berlin's many old palaces and villas. But those looking for any valuable antiques here will be disappointed. Instead, every inch of wall space is covered with old photographs. The centerpiece of the collection is a black-and-white shot of John F. Kennedy waving from an open limousine.

The day Werner Eckert took the snapshot is still vividly engrained in his mind. It was one of the most influential events of the 81 year old's life. On June 26, 1963, the 35th American president came to visit West Berlin in a demonstration of solidarity with the people living in the divided city.

"There was never anyone like Kennedy before," Eckert says, recalling the visit. "You had a feeling you could immediately become friends with him. He may have been the most powerful man in the world, but his charisma immediately made you lose any reservations."...