I stumbled across this one the other day: the NASA Earth Observatory. It’s the main website for earth observatory pictures and articles. Lots of fascinating content there, subscribing to the “image of the day” isn’t a bad idea.
The search feature is pretty cool, too. Here’s a search for all national park images captured from space: http://earthobservatory.nasa.gov/Search/index.php?g=2&q=national+park&search=search
Neat stuff!
America In Context 
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