what's your favorite tv series of all time?

I don't watch much TV anymore, so the shows I like are older.

US Shows-
M*A*S*H

Brit Shows-
To the Manor Born
Yes, Minister/Prime Minister
Fawlty Towers/Blackadder/A bit of Fry and Laurie

Documentaries:
Anything narrated by David Attenborough
Cosmos and other astrophysics docs

Those are all excellent 

CSI ... and spin off
Criminal Minds
House M.D.
Nurse Jackie
Nip/Tuck
Harrow
The Good Doctor
Space 1999
Eureka
Numbers
Warehouse 13
Fringe
Doctor Who
Heroes
American Gods
The Mentalist
Hannibal
Grimm
Smallville
Penny Dreadful
Costantine
Dracula
Star Trek ... and spin off
Boardwalk Empire
Sherlock (BBC)
The Originals
A Discovery of Witches
The Magicians
Motherland: Fort Salem
The Boys
White Collar
MacGyver
Westworld
Billions
Mr Robot
The Blacklist
All Rise