Hartheim: The Nazi Castle of Horror (2021)

In 1939, as the world stood on the brink of World War II, Hartheim Castle, Austria, was at the centre of a turning point of history. It had been a centre for those with physical or mental disabilities. But from 1939 to 1944, it acted as a pilot scheme for the 'final solution.' Hartheim: the top secret Nazi school for mass murder.