Geocities was pretty darn cool. My very first website was there but just figuring the place out, the neighborhoods and the depth of the place was like a new adventure at the time.
I chose area51
Geocities hosted my second website, my first one was somewhere on CompuServe I think? I had a GeoCities site for quite a few years, somewhere at the top level of SiliconValley. I can't remember the 4-digit number and I've never been able to find it in any of the archives just by searching for it. (I likely deleted it some time in the early 2000's.)