I'm old enough to remember UUNet as the center of the universe and by curious circumstances I ended up having them as my ISP years later (around 1999/2000) when I moved to a place that only had ISDN as the high speed connectivity option. UUNet had a POP that was local call dialable for me, due to the phone company lacking ISDN capability on the local switch: they backhauled my circuit to a city 120 miles away and UUNet has colocation there. The lowest ping times I've had before or since!