Recently, an EFL school in Japan began offering a class based entirely on Downton Abbey, which just began airing in that country. Students watch episodes, study scripts and role play scenes, doing their best to match the accents. The course was an instant hit and the school had to open more classes. Even more impressive is that some students travel as far as 600 miles round-trip to take the class!
A couple of universities in the US are also offering short courses based on Downton Abbey to teach Americans about British history and cuture.