Here's an interesting map; it's of recipients of federal subsidies from the 2002 Farm Bill. However, the location might not be that familiar:
And a satellite image of about the same area:
That's right--it's downtown Manhattan. The largest circles represent a $250,000 subsidy in taxpayer money...
Here are links to the originals:
USDA Manhattan Island Map
Google Maps satellite view of Manhattan Island
What questions does this raise when you look at it? What questions does it raise when shown to your students?