The Nazis later presided over the extermination of those arriving, with the first inmates executed in September 1941. Lilian Black, whose father survived the Holocaust, said: 'People need to think about where they are and take themselves back to that point in time when these camps were the sites of murder and genocide'.
The camp was first constructed to hold Polish political prisoners, who began to arrive in May 1940, following the Nazi conquest of Poland. Pictured: A photograph taken near the entrance of Auschwitz, which operated in Nazi-occupied Poland Lilian added: 'It is offensive to people such as myself, whose grandparents and aunties actually perished in these horrible places. Pictured: A selfie at Auschwitz Auschwitz-Birkenau was the largest Nazi concentration camp operated during the Second World War.
Lilian said: 'People need to think about where they are and take themselves back to that point in time when these camps were the sites of murder and genocide.'Think of the thousands of dead emaciated bodies that lay where you are stood.
Pictured: A couple post a picture from outside the infamous 'Arbeit Macht Frei' ('Work Will Make You Free') sign at the camp'It is offensive to people such as myself, whose grandparents and aunties actually perished in these horrible places.
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Another features a smiling man wearing sunglasses and standing on the camp's railway track - which was used to transport victims in cattle cars - with his hands in his pockets.
In the caption, the man - posting as sam.long24 - explained: 'Getting a bit of culture before the Stag Do Starts #auschwitz #birkenau #worldwar2.' After being attacked by a fellow Instagram user for wearing 'cool shades' and 'celebrat[ing] 6 million dead', he replied: '*1.3 million'.
From 1942 until 1944, cargo trains delivered Jews and other victims to the camp from across German-occupied Europe, with many being gassed to death with the pesticide Zyklon B.
Lilian Black, chair of the Leeds-based Holocaust Survivors' Friendship Association (HSFA), said she found the pictures 'deeply hurtful' and 'very wounding'.