This is a map of every person counted by the 2010 US and 2011 Canadian censuses. The map has 341,817,095 dots - one for each person.
I wanted an image of human settlement patterns unmediated by proxies like city boundaries, arterial roads, state lines, &c. Also, it was an interesting challenge.
I wrote a Python script to generate points from US Census block-level counts, and then generated the tiles with Processing. Here's more detail for the interested.
The dots are very small. Try zooming in.
The census reported that someone lived there.
The census reported that someone lives in a block which includes a lake, and that's where their dot was randomly placed. Also, some people live in the middle of lakes.