Agatha Christie's Poirot is a popular British television series that stars David Suchet as Agatha Christie's fictional detective Hercule Poirot. It first aired in 1989 and so far 57 episodes have been aired. It airs on ITV and was originally made by LWT and is now made by Granada Productions. In the United States, it airs as Poirot. [quote: wikipedia]
Concluded shows that either: the reviews are awesome, or I fell behind a while ago and I need to catch up, or I just thought this seems to be a cool series
Shows set in a long gone period of time. Even if that time happens to be the 80's. Basically everything not taking place in the present of the time of filming.