I would immediately recommend The Wire, Homeland, and Fargo.
Some others that may not be above
The Missing (Starz) – Season 2 in particular
The Night Of (HBO) – standalone season with clear ending - Turturro
The Bridge (FX) – canceled after season 2, but no cliffhanger - focus on US/Mex border
Lost – this and Good Wife are arguably the best network dramas of the 20 years
The OA (Netflix) - premiere episode is really cool – lots of risks taken in writing (if you appreciate that)
Some others that may not be above
The Missing (Starz) – Season 2 in particular
The Night Of (HBO) – standalone season with clear ending - Turturro
The Bridge (FX) – canceled after season 2, but no cliffhanger - focus on US/Mex border
Lost – this and Good Wife are arguably the best network dramas of the 20 years
The OA (Netflix) - premiere episode is really cool – lots of risks taken in writing (if you appreciate that)