There are plenty of old TV shows on youtube, and watching them again now years later I'd forgotten how good they were compared to today's stuff..
For example the 'Survivors 1975'
series is about an ordinary group of humans trying to survive after a plague has wiped out most of the human race, and there's not a silly zombie, mutant or alien in sight..
from the 1960's is another great show, it stars Patrick McGoohan as a spy incarcerated in a prison that's made to look like a holiday village, and he spends his time trying to escape.
There are also some great Twilight Zone episodes on youtube, for example in one called 'Cradle of Darkness'
, a German-speaking woman is sent back in time to 1889 to get a job as nanny in the Hitler household so she can kill the baby Adolf to prevent him growing up and starting WW2.
Another TZ episode on the time-travel theme is 'The Once and Future King
', where an Elvis impersonator is accidentally thrown back in time and hitches a ride into town in a truck driven by the real (as-yet unknown) young Elvis.
The theme of both episodes is 'could a visitor to the past really change history, or will history still happen no matter what he/she does?'