I want to add a couple of good ones I’ve found:
Jeff the Killer lost media: no one knows where the original Jeff The Killer image came from.
Mortis.com: old weird website
Also here’s a good website on various obscure computer/Internet related oddities: https://suricrasia.online/iceberg/
I’m pretty sure a YouTube channel researched this one pretty thoroughly. Try checking out the Why Files. The entire channel is fascinating, intertwining, and informative.