Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.

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188votes
The Spirit World
174votes
169votes
1.19 The End Update
165votes
165votes
Curse of the Werewolf!
163votes
Candy dimension (was: New dimension)
162votes
White sand beaches
156votes
Sky islands
155votes
Dark End - End Biome
154votes
Actualizacion 1.18: La gran actualizacion
152votes
Willow trees
146votes
Cherry trees
136votes
(Nether update) Thermal vents
126votes
Jungle Village
125votes
New Nether Biome: Hadean Springs
124votes
nether springs 1.16
122votes
Atlantis
119votes
Desert update
119votes
Underground forest
118votes
116votes
Olympus/Heaven dimension
115votes
1.19 Cattails
114votes
End Update!
113votes
112votes
Volcano
111votes
Aether In Non Modded Minecraft
110votes
Wasteland Biome