

I don’t know if I’d call it a favorite, but Time Cube is pretty iconic of Internet zaniness for a certain period. It went down in 2015, a decade ago now.
https://en.wikipedia.org/wiki/Time_Cube
https://web.archive.org/web/20150506055228/http://www.timecube.com/index.html
A 1920 pre-European-Union proposal to partition Europe into a set of radial political divisions centered on Vienna. I saved it to submit it to !map_enthusiasts@sopuli.xyz as part of a larger thread.
Higher resolution version.