Stolpersteine, or “stumbling stones,” identify European citizens taken from their homes in World War II. Each begins with the phrase “Here lived.” They then document the birth date, date of deportation or escape, and, if known, the date and place of death. Laid into the pavement in front of the last voluntarily chosen residence of these citizens, the plaques are the life’s work of German sculptor Gunter Demnig, whose inspiration comes from a passage in the Talmud: “A person is only forgotten when his name is forgotten.” AMSTERDAM — On a residential street, just steps from our hotel, four shiny...