Ask HN: What are your favourite hard-to-find sites from the “young” Internet?

There seems to be a lot of nostalgia in the comments on HN lately, harking back to an earlier era of the Internet from the 1990's and 2000's. The Internet was young, things were simpler, more magical and less commercialised.

According to these commenters, this Internet still exists today, but won't show up on any major search engine (Google seems to be the usual target of this complaint but I assume it's more or less true of other search engines too).

Growing up in a household that didn't get an Internet connection until 2006, I missed this "young internet" almost completely, and so I was wondering: what are some of your favourite examples of niche, eclectic, wholesome, fascinating, magical, quirky, mind-blowing, profound, simple, nostalgic, and/or interesting sites from this young Internet that still exist today?