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/
Also useful for enterprise, design - seeing a car in a space when it doesn’t exist yet is a useful tool. Looking into every nook is possible, sitting in the cockpit, etc. Doing it in a CAD package isn’t the same.
Also, it’s good for training and losing weight without leaving the house, provided you are consistent with it and have a good diet.