I would like maps that show the distribution of wealth in the United
States and Europe geographically, with different colors corresponding
to different levels of wealth.

In the case of the United States, it should be detailed enough to have
different shades inside a single state. In the case of Europe, it
should be detailed enough to have different shades inside a single
country.

Both maps should of course include additional information about what
each shade represents and from where the data originated.

You can visit Forbes.com.  They have a pretty good distribution of
wealth in a geographical map form.

http://www.forbes.com/maserati/billionaires2004/bill04land.html

Yes, but only of a few billionaires - not the whole population.