Just something that popped in my head and sparked curiosity. Make a list of things you've never done in vanilla survival. Wether it be something simple like finding certain ores or finding a specific biome/structure, getting all achievements, on up to making it to The End.

This originally sparked my interest when I realized something while playing version 1.9.4. Ive been playing for years, I've tackled the common nether fortresses, ocean monuments etc...and while in 1.9.4 I came upon a Witchs Hut. Yes, the most basic of basics. All that I have accomplished in my survival world, the far travels to many biomes, the finding dungeons etc, I had literally never found a simple Witchs Hut until then. So now I'm sitting back trying to remember every type of structure/dungeon/fortress I've been to, every type of biome available etc.

So Im interested to know what things have you never done?