Bastions are large structures in the Nether areas in Minecraft that are the source of Piglins, Hoglins, Piglin Brutes, Magma cube spawner, music disc, and snout banners. They can be found all across the nether except in Basalt deltas.

To find Bastions, navigate to the nether areas first and then start looking for the following biomes.

Crimson Forest

Nether Wastes

Soul Sand Valley

Warped Forest

Once you have entered the biome, you should find a big Bastion structure in it. If not, then simply look around and explore a bit and you should stumble on to it.

Note: Bastions can not be found in already explored biomes so make sure you visit a new one or an unexplored one to find one.