The unassuming regional capital of Oświęcim was the site of one of humanity's most unspeakably horrifying tragedies: the systematic murder of at least 1.1 million innocent people. From 1941 until 1945, Oświęcim was the home of Auschwitz, the biggest, most notorious concentration camp in the Nazi system. Today, Auschwitz is the most poignant memorial anywhere to the victims of the Holocaust. Many visitors, including Germans, leave flowers and messages. One of the messages reads, "Nations who forget their own history are sentenced to live it again."