My obsessions include:
The United states (Particularly New Jersey and Burbank, California, but the US in general, too).
Animaniacs/Wakko Warner (90's cartoon show - one of the reasons why I'm obsessed with Burbank, since this is where the show was based and produced)
Jess Harnell (Voice actor of Wakko Warner of the Animaniacs and also lead singer of a band called Loud (formerly Loud and Clear), who make fantastic music) He's the reason why Im obsessed with New Jersey, because he was born in Teaneck, NJ.
Tornadoes (meterology in general, really, but tornadoes fascinate me the most. One of the reasons why I love America so much, because they get many tornadoes and some of the most powerful too. Not to mention the hurricanes, also).
Earthquakes/The San Andreas Fault (more of a strong interest, than a full blown obsession)
The Golden Gate Bridge
And most recently, American accents/American english. This is more an interest, not so much an obsession, though, but, I only developed this interest a month or so ago, so I'm thinking it may eventually turn into an obsession.
As you can see, my obsessions are rather strange/specific and most seem to be interlacing in one way or another. I never noticed before I typed this, but really, you could sum my obsessions up loosely into one single obsession; the USA.