The gallery at Geoge Mason University’s Infrastructure Mapping Project has some great visualizations of various parts of North American critical infrastructures, e.g., long haul fiber, the electic power grid, and gaspipelines:

The Infrastructure Mapping Project’s goal is to provide meaningful analysis of critical infrastructure and its interdependencies with vital sectors of the US and global economy. In this pursuit we map a wide variety of networks and phenomena ranging from the Internet the power grid and spam.

Their related research papers are listed here.