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Philadelphia - Wikipedia, the free encyclopedia
- Density 4,201.8/km² (10,882.8/sq mi)Interactive Weather Map
These one of a kind, industry-leading maps that you are viewing show weather information from The Weather Channel in conjunction with Microsoft's Virtual Earth Platform, which provides aerial photos,Undercity.org
"I’m particularly fascinated by underground infrastructure and environments, as well as all of the forgotten, invisible, and abandoned places that exist in cities." Looks like an interesting