Many BBC documentary series. Personal favourites include History of India and Islamic History of Europe.
The extremely unique (probably never to be repeated in spirit) and zeitgeist-defining Julian Assange Show @ https://www.rt.com/tags/the-julian-assange-show/ and Citizenfour.
A post-facto interview based documentary whose name I forget, perhaps Real War, about Russian military human rights abuses in the Caucasus, which was extremely shocking.
Many SBS Dateline reports.