I've heard many people say things like "Game of Thrones is the cooler/ better/ non-lame/ whatever version of Lord of the Rings." Their slightly inarticulate implication being that Thrones is a vastly superior take on the old medieval fantasy genre. I totally agree. But really, it is so much more than that.
Although it's already fairly entrenched as a part of popular culture (thus technically not "underground"), and is also an HBO show (so it's not "overseas"), I still feel this is as good a place as any to post an article explaining the reasons everyone needs to begin watching Game of Thrones.