More to the point, if science fiction is any guide, building underground cities is usually a bad idea.

FORBES: Underground Living is a Solution in Search of a Problem

Let this roadmap be your guide to the American states and cities that have elevated the act of slow-cooking meat to an art form.

BBC: The geography of American barbecue

Aside from its gorgeous graphics and challenging gameplay, the hook here is that players guide a convoy of armored, mobile attackers through the winding streets of cities seized by an alien menace.

FORBES: 5 Excellent Tower Defense Games For New iPad Owners