Best Time Travel Stories?

I love everything time travel... stories like Days of the Future Past and Age of Apocalypse are one of the main reasons I love the X-Men. 
 
So, what are the best time travel stories out there? 
 
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My Youtube Channel - http://www.youtube.com/vza036

Ever try Doctor Who stuff?

Back to the Future Triliogy

@PlasticBag: I never thought I would like westerns until I saw Back to the future 3. That movie was awesome.

52, red son , love AoA (not current series blech), dr who

@Twentyfive: Same here. It really was a good movie.

Rock of Ages and Booster Gold Vol 2.