Although it initially had no single central nexus, one eventually formed in the underground parking garage of an office building in Vienna, VA. I had a chance

Although it initially had no single central nexus, one eventually formed in the underground parking garage of an office building in Vienna, VA. I had a chance to see this ~10 years ago. A data center where a fair amount of "servers" were rows of desktop computers. The top of the building had a whole bunch of antennas and satellite dishes. I never knew the history until you posted this link. :)