Air-time legends: the longest-running TV series ever
'Criminal Minds' will end an epic run with its 15th season
The word is out: 'Criminal Minds' is set to go out with a bang after its 15th season has just been announced. The show celebrated its impressive 300th episode in the fall of last year. However, it's certainly not the only series out there that has been on the air for an impressively long time.
Click through this gallery to see the world's longest-running TV shows.
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