I like documentaries about people or social issues, and I love ones about travel.
One of my favourite TV shows ever was a Canadian one called Departures which was kind of a documentary style where these three guys would travel to different countries and try to get a perspective different from the touristy side of things. They ended up seeing and learning so much, both about the places they visited and themselves, and the cinematography is stunning. Definitely recommend that series to everyone, I think the first 2 seasons are actually on Netflix!
I love science documentaries, animals, stuff about supernatural ****, UFO's, disasters, bout my fav artists, bout food, history documentaries (only stuff like stone age, egypt and dinosaurs tho, no WW2, middle age etc.), space, sometimes crime.