Barn.png
Barns spawn on the far outskirts of villages (>5 chunks, < 10 chunks from a village)
RuinedNetherPortal.png
A ruined nether portal, similar to the ones added to the vanilla game in 1.16.0, but a bit simpler, and without loot or lava. Mojang may have outdone me here.
Yekhchal.png
Yekhchals, ancient structures used for refrigeration, can spawn in desert biomes
RedSandstoneWell.png
A small red sandstone well can generate in the desert