1973 ARPA network map.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...p_fullsize.jpg


More:

https://en.wikipedia.org/wiki/ARPANET

Previously:

Cleaning an underwater data center - GIF
Sending and receiving emails in the 1980s - photo
Internet browsing keyboard for the blind - GIF
Taking screenshots in the 1980s - photo