This is the first thing I found that started this whole bit of research:

http://www.ajc.com/news/atlanta/former-secret-test-site-616831.html?cxtype=rss_news

Dawson Forest is owned by City of Atlanta and is planned for a water reservoir or a 2^nd airport:

http://en.wikipedia.org/wiki/Dawson_Forest

Which used to be the site of the Georgia Nuclear Aircraft Laboratory

http://en.wikipedia.org/wiki/Georgia_Nuclear_Aircraft_Laboratory

This is a link to the history of the testing facility:

http://www.pickensprogress.com/archive/insidedawsonforest.html

Another link to the history, summary basically:

http://northgeorgiamountainramblings.wordpress.com/2010/04/28/when-the-cold-war-came-to-dawsonville/

Youtube video about the facility

http://www.youtube.com/watch?v=Bn6N2iV2_os

Here are some flickr pictures about it (some very good ones):

http://www.flickr.com/photos/robertlz/sets/72157600036376038/detail/

Some more pics in this page:

http://www.abovetopsecret.com/forum/thread230310/pg8

Some dude’s blog post about it:

http://northgeorgiamountainfreak.blogspot.com/2008/05/north-georgias-area-51-in-dawsonville.html

Some more pictures and a map:

http://wiki.worldflicks.org/dawson_forest_-_a.k.a._georgias_area_51.html#coords=%2834.367419,-84.16832%29&z=13

AboveTopSecret.org link with a bunch of stuff:

http://www.abovetopsecret.com/forum/thread230310/pg15

Some videos from a guy who went there:

http://www.youtube.com/user/Ratz667#p/a

Facebook page about it:

http://www.facebook.com/pages/Dawson-Forest-GNAL/154640534555862?v=app_4949752878

Geocache site with some pics:

http://www.geocaching.com/seek/gallery.aspx?guid=40ed95a9-8c89-44da-83d8-130820a25849

Link to a pdf about the radiation measurements:

http://www.gaepd.org/Files_PDF/gaenviron/radiation/radrpt2002_dfw.pdf

Affect on pine beetles:

http://links.jstor.org/pss/2473643

Time Magazine article on the pines:

http://www.time.com/time/magazine/article/0,9171,895712,00.html

Pictures (old ones)

http://www.abovetopsecret.com/forum/thread230310/pg12

More pictures from satellite:

http://virtualglobetrotting.com/map/abandoned-government-lab/view/?service=1