In 2019 the gaming channel OneyPlays created a Minecraft let's play series in a server that started out private but was later made public so their viewers could join in on the fun. The series basically devolved from normal survival minecraft gameplay to flying around in creative mode using admin abuse to terrorize fans (I make cameo appearances) https://www.youtube.com/watch?v=8mEU3PJgfFg
In 2020 the server was shut down because they created a GTAV server instead. HOWEVER, some of the server regulars were given a world download, and some of them went on to host a server with the old map for a while (https://www.reddit.com/r/OneyPlays/comments/136a522/i_have_the_world_files_from_the_minecraft_videos/ https://www.reddit.com/r/OneyPlays/comments/l25olc/the_oneyplays_minecraft_server_is_back/)
There's not a public download link for the world anywhere I can find though. I'd like to locate someone's copy so this can be available for anyone to freely use.
Someone made a wiki which includes among other things a very long list of players from the server and some of these people probably have a world download: https://oneymc-server.fandom.com/wiki/List_of_Players