I have seen a lot of TV-series and highly recommend this list - Prison Break, Breaking Bad, Game of Thrones, Walking Dead, Peaky Blinders, Gotham, Sense 8, OITNB, Orphan Black, Homeland, Grimm, Better Call Saul, Lie To Me, Breakout Kings, The Tomorrow People.
these are just many of the TV-series I've watched and very much liked when I finished them(some of them are still airing or are in the process of making a new season.
Here is a list I haven't got to finish yet but also recommend you to watch as they are very much interesting - Suits, Marvel's Daredevil, Sons of Anarchy.