World Records

The World Record Book

http://www.guinnessworldrecords.com/

World's Billionaires

http://en.wikipedia.org/wiki/List_of_billionaires_(2009)

Biggest cities in the world

http://en.wikipedia.org/wiki/List_of_cities_proper_by_population

http://en.wikipedia.org/wiki/List_of_metropolitan_areas_by_population

World Richest Countries

http://www.aneki.com/richest.html

http://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nominal)_per_capita

http://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)_per_capita

Richest Cities

http://www.citymayors.com/economics/richest_cities.html

http://www.citymayors.com/statistics/richest-cities-2020.html

http://en.wikipedia.org/wiki/List_of_cities_by_GDP