German artist Gunter Demnig created these two Stolpersteine in memory of Samuel Sigmar and Alice Berta Gunzburger in 2005. He embedded them in the sidewalk in front of Poststrasse 6, Freiburg im Breisgau, Germany, the couple’s home until they fled the country with their children in 1938. These “stumbling stones” number among more than 30,000 that Demnig has embedded in countries throughout Europe to memorialize Hitler’s victims — each one individually at the site where he or she had lived before the Holocaust.