King Orange's bastion remnant is a structure in the Nether, which was the home of an army of Piglin Brutes. It was later taken over by King Orange. Since his defeat, the fortress remains unseen, but is likely still used to access portals located within it.
Plan room: On the 2nd floor of the castle, there is a room with a big throne and maps on the wall with the steps to destroy Minecraft using its icon.
Monitor Room: Somewhere on the 2nd floor, there is a room with maps that act like cameras that show the Piglin Brutes watching the Parkour Course.
Prison Tower: The prison tower is located outside of the throne room, where prison cells are there to keep Red's pig and Green locked up.
Throne Room: Above the 1st floor is where the cages for the Fighting Stick Figures were kept, there are stairs from the roof leading down with a jukebox, the 2nd portal to the village, and Blue and Yellow's thrones.
Obsidian Cube: Inside the obsidian cube is the parkour course
Village Portals: When Yellow and Blue escaped the parkour, they went through a portal that's now blocked with cobblestone. 2 more are located nearby also blocked off with cobblestone. The final portal leads to King Orange's throne room.
The type of bastion remnant where King Orange resides is a treasure bastion, the one with the best loot and has a cuboid shape.
In every Season 3 episode before The Ultimate Weapon, the bastion remnant isn't damaged at all. And in every Season 3 episode The Ultimate Weapon onward, it is damaged.