It's been 70 years since the Soviet army liberated the Auschwitz-Birkenau concentration camp on 27 January 1945, but the tragedies that occurred there are still fresh in people's minds.
The BBC has now flown a drone over the top of the compound, which was once Germany's largest concentration camp, to get a bird's eye view of how it looks today. The resulting footage, above, is as mesmerising as it is chilling, and has already become the most-watched video ever on the news outlet's YouTube channel.
Perhaps most striking is how ordinary the site looks - it's hard to imagine that more than a million people, most of them jews, died in the concentration camp between 1940 and the start of 1945. It's also far larger than I expected, and unusually empty - the UNESCO World Heritage Site is now run as a museum by the Polish Culture Ministry, and is visited by thousands of tourists and survivors every year.
In the video you can see the railway tracks that lead into Auschwitz-Birkenau - trains packed with jews and other people deemed undesirable by Hitler arrived at the camp almost every single day between 1924 and the European summer of 1944.
You can also see the entrance to the original camp, Auschwitz I, with its now infamous wrought-iron sign over the gate with the words "Arbeit Macht Frei", or "Work sets you free", as well as the ruins of the wooden huts at Birkenau, which was built in 1941 with the sole purpose of being a death camp.
The footage also shows the courtyard between Auschwitz blocks 10 and 11, which was known as the "Block of Death" by prisoners. As the BBC explains on their YouTube channel: "Executions took place between Block 10 and Block 11 and posts in the yard were used to string up prisoners by their wrists."
This isn't the first time that drones have explored the site of former tragedy - a drone recently filmed the deserted Chernobyl exclusion zone - and although it can be upsetting to watch, let's hope this kind of footage helps society never forget where we've come from, and the mistakes that have been made.
Source: BBC