During World War II, when Poland was occupied by Nazi Germany, the Wawel Castle was the residence of governor general Hans Frank, later to be executed as a German Nazi war criminal; during his despotic regime Raphael's "Portrait of a Young Man" (1513–14), part of the Czartoryski collection, was removed from Wawel and to this day has yet to be returned to Poland. Many of the tapestries have disappeared too, their whereabouts unknown; however, 150 of the tapestries which along with many of the Wawel's other treasures had spent the war years, for safety, in Canada have been returned to the castle and are, today, part of the Wawel Royal Castle National Art Collection on public display along with countless art treasures and items of historical Polish significance.