Locate the Blaze Spawners as soon as possible.Small balconies in the side of the structure.

Random chests sitting in certain corners, containing loot.Rooms with a 'stairway' of nether brick placed against a wall, leading up to the floor above.Some of them could lead only to Netherrack. Rooms with blaze spawners, nether brick stairs can lead up to them.Rooms with nether brick Stairs in the center and Soul Sand at sides of the stairways with nether wart growing on it.Lava well rooms which separate inside and outside areas.They are very big and will make a good base in the Nether because of nether brick's blast resistance. They are also the only place where Wither Skeletons spawn naturally. They often contain many Blaze spawners (please note that blazes are the source of potions). They are one of the two places that Nether Wart can be naturally found, the other being bastion remnants (the only exception being the Legacy Console Edition, in which case nether wart is found randomly scattered about the Nether). They include bridge structures constructed of Nether Brick, Nether Brick Fences, and Nether Brick Stairs. Nether fortresses were first introduced in Java Edition Beta 1.9 pre-release and Pocket Edition 0.12.1 build 1.

Bastion remnant nether wart