ATT Building

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This ATT Building used to be one of 2 emergency regional centers for the entire US ATT phone system; it was built to handle the ATT phone network during emergencies.

It was built outside of Atlanta because of the recommendation, at the time, to build the phone center away from large population centers in case they were hit by nuclear weapons.
For an much more extensive(and interesting) history of this facility, see the following links (especially the first one):
1: lots of details: web.archive.org/web/20080113223123/http://home.speedfac...
2: from Att itself: www.corp.att.com/history/nethistory/management.html
3: Rockdale housed the first TSPS switching machine for all of Atlanta and the surrounding area: www.centralofficeonline.com/
Uncertain as to whether they offer tours of the inside.
4. According to these two links, the Rockdale facility was at least a 10PSI hardened facility (able to withstand a 20 megaton nuclear blast 5 miles away). web.archive.org/web/20010923164727/users.shore.net/~mfo... & web.archive.org/web/20011013005349/users.shore.net/~mfo...

Additional info:
1972 map: web.archive.org/web/20020204000803/users.shore.net/~mfo...
Microwave Radio and coax cable connections as of January 1976: long-lines.net/places-routes/maps/GA76.html (The dot on the map labeled as Rockdale is probably this facility.)

**License: public domain**