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From my understanding in a lot (at least a few) National Parks not all of the land is owned by the park. There are spots of land in the parks that are privately owned; and, some people have decided to build homes on that private land in the National Parks.

CBS Sunday morning had a piece [1] on the whole deal with people building homes in national parks.

[1]http://www.cbsnews.com/8301-505263_162-57530300/national-par...

Same, I live near a National Forest boundary and it's showing a substantial number of dots inside that boundary in places where there are most definitely no homes. There are occasional chunks of private land within the boundary, but not where these dots are showing—they are, in fact, often within a designated wilderness boundary which allows no permanent residents or active buildings.

The dots are not placed to exact addresses, but roughly evenly distributed within census blocks. The number inside the block should be correct, not the exact placement.

Hermits in treehouses?