Why to watch:
After just a single season, "Downton Abbey" captured the world by storm. The British television show offers a glimpse at a specific time and place in history in a way similar to "Mad Men," and Season 3's finale sets up an interesting fresh start in Season 4. If you aren't already watching "Downton Abbey," it's time to start.
Where to watch: Amazon Instant Video
When to watch by:
Fall 2013 when Season 4 airs in the United Kingdom, or Jan. 5, 2014 when it premieres in the United States.