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USENET in 1981. The topology of the BITNET in 1981 (partial map) The NSFNET infrastructure and topology in 1991.
Periodis Web - A Historical Atlas and Gazetteer of Europe from Year 1 to 2000 Europe in Year 2000 Europe in Year 1900 Europe in Year 1800 Europe in Year 1700
It is neat watching the rise and falls of the Roman Empires, the fracturing of the Islamic Caliphate, the rise of the nation-state, and more. The maps are surprisingly detailed and some centuries have city plans available for view by Sep 3