My top 5, all are highly recommended:
A Game of Thrones
The Man in the High castle on Amazon Video
What if the Nazis would have won WWII?
A nice dystopia series based on the book with the same title.
Black Mirror on Netflix
All about future technologies and their effect on society. Since all episodes are stand alone works, you can watch it whenever you want without having the plot in mind.
Marco Polo on Netflix
Reminded me of GoT, though it doesn't dive into Fantasy. Unfortunately, it just lasted for 2 seasons and was cancelled afterwards since Netflix had a loss of USD 200mio.
Mr. Robot on Amazon Video
A brilliant hacker series which doesn't get too far away from 'actual hacking'.
Not like e.g. Live Free or Die Hard