The map portal of the Swiss government also has a bunch of old map layers available. For example, here's Zurich in 1883. https://map.geo.admin.ch/#/map?lang=en

The map portal of the Swiss government also has a bunch of old map layers available. For example, here's Zurich in 1883. https://map.geo.admin.ch/#/map?lang=en&center=2682327.37,1248165.73&z=6.273&bgLayer=ch.swisstopo.pixelkarte-farbe&topic=ech&layers=ch.swisstopo.zeitreihen@year=1883;ch.bfs.gebaeude_wohnungs_register,f;ch.bav.haltestellen-oev,f;ch.swisstopo.swisstlm3d-wanderwege,f;ch.vbs.schiessanzeigen,f;ch.astra.wanderland-sperrungen_umleitungen,f https://map.geo.admin.ch/#/map?lang=en&center=2682327.37,124...