Fallout 3

Is this an open game? Can I just wander endlessly or does it suffer from Questitis and Invisible Barrier Syndrome?

I'm not asking if I can walk to Australia, just if the play area consists of open countryside, lots of towns, open buildings, etc. that I am free to explore as much as I want. Is it populated with lots of creatures that are worth killing?

Fallout 3 isn't as opened ended as Morrowind-Oblivion. It's more of a traditional non-linear RPG. However once you get to certain point in the main quest. You cannot explore the world anymore.
 
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