I don't remember where I ran across oldweb.today but I thought it was a pretty rad idea. I was able to find an old version of my website there and enjoy it in a browser similar to what I would have been running back then...
I have been meaning to play around with containers for a while but for the life of me have not found a real reason to. I feel like without a real use case, any attempt I'd make to learn anything useful would be a huge waste of time. There are a bunch of neat toys out there, from running random ASCII art commands to a crazy script that 'emulates' some of the insane Hollywood style computer screens, as well as base images for all manner of application stacks and frameworks, but all of those are easily installable using your favorite package manager.