Here is a set of geographical maps of the ARPANET in the 1970s and 1980s. There is also one “logical” map that focuses more on which host computers were connected where.
The ARPANET was a precursor (some would say “the precursor”) to today’s Internet. It pioneered transcontinental and transoceanic digital networking, adaptive routing, modern email, and many fundamental concepts of flexible, fault-tolerant digital data transmission. At least, those are the concepts I can think of off the top of my head.
The name “ARPANET” is short for the ARPA Network. ARPA was the original name for today’s “Defense Advanced Research Projects Agency” (DARPA) of the US Department of Defense. They paid to develop both the ARPANET and the basic technologies underlying today’s Internet.
Cryptosmith 
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