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/
Did anyone ever work out who Satoshi Nakamoto is?
Every few years I look up if new evidence has been found and/or new suspects show up.
It’s always entertaining, but I’m guessing Satoshi Sakamoto is as smart as they come and we’ll never know who he/she is.
No, and at this point probably the proper question is who he was. He has been too quiet for too long and too many important topics that could have been resolved immediately had he taken a side, the biggest example for me is the block size debate.