JAVA 1.21.9+
Seed: 6013725138210392839
Mansion less than 2k blocks from spawn with stone in the roof, 6 ancient cities in weird triangle formation (stronghold somewhere in the middle) + 1 under a huge pale garden, lush cave and mineshaft. Weird end generations, the main island is kinda strange and the end gateway spawn when you enter is above just a few blocks. Found several pairs of gateways with 45-60 blocks between them. Also the obsidian platform is completely exposed, about 10-15 blocks from nearest end stone. Other strange formations like ruined portals directly connected to bastions/spawned in their own bubble underground, snowy village/ice spikes/buried treasure/igloo/shipwreck all in one place (also less than 2k from spawn)
Also a strange stronghold with ancient city and mineshaft both overlapping in library.
Here are some pictures, enjoy!
(It's also strange I found this randomly while pressing "random" on ChunkBase)
by kranberriemuffins