Ancient City
Overworld (deep dark)

How to find it
- Generates in the deep dark biome, with its floor at Y=-51, often under mountains and other low-erosion areas
- Dig down from a mountain or find a deep cave that reaches deepslate levels
- /locate structure minecraft:ancient_city with cheats on
Loot
- Chests with items found nowhere else, such as disc fragments, armor trims and echo shards (craft the recovery compass)
- A chest with a golden apple in the city center
Dangers
- Sculk sensors hear you walk, place and break blocks - sculk shriekers summon the Warden
- The Warden: 500 HP, sonic boom attack that goes through walls and armor. You are not meant to fight it
Tips
- Bring stacks of wool: it dampens vibrations so sensors do not hear you.
- If the Warden spawns: leave the way you came, quietly. Source: minecraft.wiki Ancient City.
Related: Abandoned Camp