The Dungeon World setting lies within the inside of a world.  The
exterior of the world is left up to the DM as it will not come into play.
Dungeon World is in fact a network of caves that revolve around a center
point that is actually a shaft that stretches upward and downward as far as
the eye can see.  There are hundreds of ledges and openings that lead to
the different "civilized" areas.
	As for the inhabitants of this strange place, one can really use
his imagination.  All caverns are assumed to be lined with a special moss
that radiates light, but no heat.  Thus far, no one has learned how to
grow it or transport it.  Luckily it has been within all of the caverns
that are inhabited.  Below I have done a general overview of the
"civilized" areas starting at the "top."

THE FREE CITIES:
	The topmost mile of "civilized" caverns are inhabited by the
giants of the Free cities.  There is no form of government in the cities
and everyone lives in a complete anarchy, free to do whatever they please.
There is a catch, however, you must be a giant.  Any non-giant that should
walk through the streets of the cities are subject to being enslaved.  Due
to their lack of government, thieves are also scarce.  Any item that
someone needs can be stolen and nothing can be done about it, except fight
for it or steal it back.  They are still extremely primitive in nature as
can be gathered by their lack of ability to do anything organized.

THE DRACONIAN EMPIRE:
	The next two miles down is the Empire Draconis.  The emperor Alec
Dracos rules over the entire area in absolute power.  His empire is
relatively peaceful and trade flourishes throughout.  There is a strong
prejudice to their neighbors above, however; the giants sometimes form
raiding parties when slave supply is low.  The Dwarves of Stronghome,
however, are their main source of precious metals and relations with the
stubborn dwarves are good.  Other races roam the streets peacefully, though
no one, save those of human background may become citizens.

THE MIXED CITIES:
	As the name may imply, these caves and cities are the homes of
anyone who wants to live there.  An absolute democracy, the ruler changes
every few weeks.  It is mostly a military state, however, and the Senate
is often "influenced" by the militia.  In fact, the Dark One, the General,
almost controls the Mixed cities as a dictatorship.  The legions that he
controls are estimated at 75% of the entire population.  Relations with
all of the other cities are non-existent, as anything needed can be found
within their caverns.

STRONGHOME:
	Below the Mixed Cities lies Stronghome, the most fortified of
caverns.  The four-foot high caves prevent all of but the stoutest of
humans to enter.  Entering these caves requires passage through fifteen
iron portculli, full with murder holes an other death traps.  On friendly
terms with Emperor Dracos, King Gantor has agreed to trade iron from their
mines for food, cloth, and medicinal plants.

	Below Stronghome lie the goblin cities (or slums as they seem),
housing the trolls and the goblinoids.  Even further below are the drow.
Not much is known about the Imperium of Salt, save that most of the
population are slaves.  The few that have made it below and survived
returning home tell of men with the heads of octopi, that can fry
someone's mind with just a thought.  Others tell of frightening floating
balls of eyes that seem to ignore anyone down there, fighting amongst
themselves in some inter-racial war.