See also: BondiBeach, NewYorkCity, LondonTown, AmericanCulturalAssumption

The capital of the world used to be gold, but now it is mostly U.S. fiat dollars backed with nuclear missiles. 

On another level, the capital of the world might be considered labour, skill or even people, but that's too depressing to think about.

See also http://usemod.com/cgi-bin/mb.pl?NaturalCapitalism.

Alternatively, the capital of the World is "W". ''(But the capital of The World is "T"...)''