The palace is made up of long corridors with 2-block-deep layers of gray wool on the floor, and some rugs made of blue, light blue and cyan wool or carpet floors to prevent vibrations, as well as some smaller ruins off to the side of the main corridors, which contain either one or two loot chests. The floor of the city always generates at the Y level of -51. An ancient city features a very large palace with a footprint of around 220 blocks on each horizontal axis, stretching throughout a deep dark biome.