The National Day of Remembrance for the Victims of the Nazi German Concentration and Death Camps is observed in Poland every June 14. This solemn remembrance day was officially established in 2006 by the Sejm and commemorates the first mass transport of political prisoners to Auschwitz concentration camp on this date in 1940. Originally focused solely on concentration camps, the observance was expanded in 2015 to include death camps, highlighting the systematic extermination carried out by the Nazis. Concentration camps were initially created to detain political opponents and other marginalized groups, while death camps were specifically designed for mass killings. Some of the largest camps, including Auschwitz-Birkenau and Treblinka, were located in Poland. The day is typically a working day unless it coincides with a weekend or the public holiday of Corpus Christi.