CityWorld — reforged for NeoForge

Drop into an endless, hand-crafted-feeling city — procedurally generated, seed-deterministic, and packed with detail: named streets, furnished buildings, roundabouts, factories, farms, mines, sewers, and wild nature in between. This is a full NeoForge port (and, on Minecraft 1.20.1, a Forge build) of the classic Bukkit/Spigot plugin CityWorld, rebuilt from the ground up for modern Minecraft — same generator brain, same GPL-3 license, now a world type you can pick from the create-world screen.

Battle-tested across 135 worlds and 3.2 million generated chunks — over 830 km² of procedurally generated city, more ground than New York City covers.

New in 5.13.0: the city knows where every structure will be. CityWorld now makes the same placement call Minecraft will make, ahead of any chunk, so it keeps clear exactly a structure's real footprint — no more empty fields reserved for a structure that never came, and the city builds right up to a village or a Cataclysm prison. The ground under a big modded structure is shaped on every side and rises to it as a hill rather than a terraced pyramid; a structure that cuts into a hillside can be declared shave so the hill slopes down onto it instead of ending in a face. The minute-long stall next to a large modded structure is fixed. 5.12.0, released the day before, was the first half of the same arc: structures sit in the land rather than on it, never dig moats, and aim at a building's base.

New in 5.11.0: Minecraft 1.20.1, on Forge. The first CityWorld build that is not NeoForge — asked for here in the comments, because 1.20.1 is where a great many mods still live. Nothing is cut down for it: every world style, the ruined Nether and End cities, strongholds, interiors, schematics, the Customize screen, and the furniture and map mods all work as they do on the newer versions, and a seed builds the same city there as everywhere else. The other five versions are unchanged.

New in 5.10.1: Minecraft 26.3. A build for the 26.3 line, where campgrounds pitch their tents from wool stairs the way 26.3's own abandoned camps do, the new dappled forest joins the climate, and poplar turns up in buildings by itself. The other four versions are unchanged and stay on 5.10.0.

New in 5.10.0: Macaw's fits the city out — doors, windows, fences, roofs, staircases and lights from the Macaw's mods (see below), pitched roofs on modern houses, silos and gasometers in industry, and a Minecraft 1.21.1 build alongside 1.21.11, 26.1 and 26.2.

New in 5.8.0: every street has a name you can use — /cityinfo and the map name the road you are on, JourneyMap labels the streets of cities you have not reached yet, and /cityfind street finds one. Plus a proper two-chunk airship drifting over the wild.

New in 5.7.0: JourneyMap support, see below — the map draws the city plan over ground nobody has explored, and names what is planned in any chunk you point at.

What you get

Pick CityWorld as your world type and you land in a living city:

• Roads and infrastructure — named streets with real street signs (and the name on /cityinfo, F3 and the map), sidewalks, roundabouts (with statues), bridges, tunnels through mountains, and the odd hidden lift shaft in a 4-way crossing below.
• Buildings, furnished — houses through highrises, all fully furnished inside: kitchens, living rooms, bedrooms, libraries with chiseled bookshelves, offices, shops with the right job-site block for their trade (cartography tables, fletching benches, looms, smokers…) and a hanging sign out front.
• Districts — municipal civic centres, industrial factories/warehouses (with bunkers underneath), farms with animals and crops, and parks with zoos and glass biodomes.
• Underground — mine networks with copper-age fittings, ore veins that get richer with depth, cave-spider nests, hanging lanterns, and vertical lift shafts; wet sewers; bunkers and basements with loot and mob spawners.
• Nature and caves — mountains, seas with beaches, and (in MODERN/APOCALYPSE) wandering, branching cave tunnels like vanilla's, and basalt-lined lava pools instead of a flat lava sea. Underground you will find real cave biomes in patches — lush (moss, glow-berry vines, dripleaf, pools with axolotls/frogs/tropical fish, surface azaleas), dripstone, deep dark, and sulfur caves on Minecraft 26.2 and later — each decorated the way vanilla decorates it.
• Vanilla structures where they belong — strongholds (so eyes of ender work and the End is reachable), trial chambers, and ancient cities in the deep dark. Villages and mineshafts stay off: CityWorld builds its own. A datapack tag can widen the list, including to another mod's structures.
• Inhabitants — named villagers employed at their shop's actual trade, animals in the fields, fish in the sea, hostiles lurking in mines, sewers and the dark.
• Set-pieces — castles, radio towers, oil platforms, flying saucers, hot-air balloons, two-chunk airships with a crewed control car, campgrounds — scattered rare landmarks, findable with /cityfind.
• Custom schematics — a bundled catalog of classic buildings, plus drop your own (.schematic/.schem/.litematic/.nbt) into a config folder and turn them loose in the city.

The map knows what the city is — with JourneyMap

New in 5.7.0. Install JourneyMap and the map gains what only CityWorld can tell it. A map mod draws what you have seen; CityWorld decided where every road and district goes before anyone arrived — so the map shows the plan, over ground nobody has explored:

• Districts tinted by what they are — highrise, municipal, industrial, park, farm — with the street grid over them, and the roads running out through the countryside. It stays drawn behind you as you travel.
• Point at any chunk and it tells you what is planned there — the district, the kind of lot, the schematic's name, the shop, and what is inside the building: "Highrise · office building · Office cubicles", "Farm · Potato field". Places nobody has visited included.
• Streets are labelled on the map once you zoom in (new in 5.8.0), cities you have never visited included, and pointing at a road names it.
• Rare landmarks become waypoints as they generate, and /cityfind, /cityfind lot and /cwlocate drop a marker on whatever they find — in two separate groups, so the world's own discoveries and your searches can be shown or hidden apart.
• Controls where you would expect them: a City plan switch in JourneyMap's options, a button on its fullscreen map, and /citymap for servers. /citymap keep <n> sets how much of the plan your client holds, because that cost is yours, not the server's.

It is a soft dependency in the proper sense: no JourneyMap, no difference — CityWorld does not touch a single one of its classes unless it is installed.

Beyond the overworld — the ruined Nether and the End

New in 5.9.0. A CityWorld world type now comes with its own Nether and End (switch either back to Vanilla under Customize → Realms):

• The ruined-city Nether is the overworld's own city — same seed, same streets, same buildings — burnt and collapsed, in Nether biomes (and Biomes O' Plenty's, when installed), on netherrack and blackstone with lava seas. Portals link 1:1, so the ruin you arrive in stands where its overworld building does. Full height, no bedrock roof; fortresses and bastions still generate, each bastion in its own cavern with a ruined shaft down to it from the street.
• The End is vanilla's throughout — the central island, the dragon fight, the void ring, the outer islands with their chorus forests and end cities — with CityWorld's cities on the flat tops of the outer islands: clumps of city and clumps of wild End, streets lit by end rods, buildings blended with purpur and end stone brick, never ruined (the dragon kept everyone out). Biome mods' End biomes generate in the wild stretches. Nothing digs through the islands; basements go only as deep as the rock allows.
• /cityworld visits the city before the fall — the overworld's own plan, pristine.
• Modpacks can lock any of it: lockedWorldPreset, ruinedNether and cityworldEnd in config/cityworld-startup.toml.

Furnished — and furniture mods make it more so

New in 5.5.0: every building has an interior. Offices and apartment towers, schools and courthouses inside the government buildings, museum exhibits, factory control rooms, stocked shops and warehouses — lit, labelled (check F3), and furnished down to the basements. Vacant buildings hang FOR SALE / TO LET signs and stay dark.

Install Macaw's Furniture, MrCrayfish's Refurbished Furniture or Fantasy's Furniture (any of its sets — Nordic, Necrolord, Dunmer, Bone — plus the Decorations add-on) and the whole city upgrades: real kitchens with fridges and stoves, two-block baths, sofas, desks with computers, ceiling fans, two-tall chairs and double beds, stocked shelves, tables cluttered with books, bottles and tankards — over a thousand modded pieces, every one facing the right way. New in 5.6.0: a Fantasy's Furniture set released after this version is recognised at startup and furnished on the spot, and APOCALYPSE draws on a grim set of skulls, cobwebs and bone piles. Without furniture mods, rooms keep a classic vanilla look. Mod authors: adding your own furniture takes two data files in your jar — see PALETTES.md in the repo.

Macaw's fits it out

New in 5.10.0. Install any of Macaw's Doors, Windows, Fences and Walls, Roofs, Stairs, Trapdoors or Lights (Macaw's Furniture already furnishes the rooms, see above) (and the Biomes O' Plenty add-on, which joins by itself with every BoP wood) and the city is built with them. Every house, shop, office and factory picks its street door by what it is for — cottage and modern doors on homes, glass shop fronts, metal doors and garage doors three to seven high on industry — and its interior doors to match. Houses get framed windows joined into runs, a trapdoor hatch, and pitched roofs in Macaw's roof blocks, matched to the wall wood, with eaves, ridges, valleys and gable ends; their stairs become Macaw's compact and terrace treads with railings, landings and balcony rails, and office stairwells take the same treads and platforms. Gardens and parks are fenced in picket, hedge, ornamental metal and stone walls, paddocks and barn pens in farm fences with a gate, construction sites and factory yards in industrial mesh and panelled metal (barbed wire now and then), and every park or yard sticks to one fence. Streets are lit by Macaw's lamp posts, park gates by garden lights, campgrounds by tiki torches, and interiors by its wall lanterns, sconces, chandeliers, ceiling lights and lamps. Without the mods nothing changes — each pool falls back to what CityWorld always built.

Industry itself grew: silos — a metal tank on a red steel frame with a hopper chute, a stepped cone roof and a caged spiral stair up to a catwalk on the roof, often in batteries — and rare gasometers, two or three chunks square, a telescoping gas holder in a lattice frame standing in a water trough, its bell at a different height on every one. The old nether-brick silo schematics are gone.

World styles

Thirteen selectable styles, each its own world type (cityworld:<style>) or a click away on the Customize screen:

Configure everything

CityWorld has around 100 tunable settings — which features generate, spawn/treasure odds, terrain toggles, city radius, decay intensity, even the villager-name and mob lists. Because settings are per-world, they ship as a datapack, not a global config: edit them by hand, or use the in-game Customize screen and export what you like with /cityexport.

→ Full settings reference, example datapacks, and guides (villages and other vanilla structures, a gentler apocalypse, sparse cities, custom villager names, taller skyscrapers, and more): sablecraft.co.uk/cityworld-reforged

Your other mods' blocks build cities too

CityWorld's building palettes are block tags, not a fixed list. A mod that tags its blocks the normal way — planks in #minecraft:planks, stone in #c:stones — starts appearing in cities the moment you install it, with no patch and no compatibility pack. The odds stay put as the palette widens, so a heavily modded world gets more variety, not more wooden houses. For mods that don't tag their blocks, or to put a mod's blocks somewhere they wouldn't naturally go, a small datapack extends any palette directly.

And your biome mod's biomes

Install Biomes O' Plenty — or anything else built on TerraBlender — and its biomes generate in your CityWorld world. Not a handful of them: with BoP installed, all 59 of its overworld biomes appear, over about a third of the ground, with CityWorld still naming the rest. Its cave biomes go underground where they belong, and biomes whose look is their ground — gravel beaches, volcanic plains, salt wastes — get their real blocks rather than a grass stand-in.

On by default, because installing a biome mod is itself the request. world.moddedBiomeShare sets how much ground a mod may own, world.useModdedBiomes turns it off entirely, and both cost nothing when you have no such mod.

Farms grow your mods' crops

Crops and flowers come from tags too, so Farmer's Delight cabbages or a biome mod's wildflowers grow in CityWorld's fields. Two-block crops work — Biomes O' Plenty's barley stands full height — and a plant that can't survive where it was sown is quietly swapped for one that can, so a field is never left bare.

Commands

/cityinfo tells you what's under your feet, street name included; /cityfind//cityfind lot/ /cityfind street//cwlocate track down a specific building, landmark, street or biome; /cityschem pastes catalog buildings by hand; /cityexport bottles a world's settings to hand to a server.

Every command is a permission node (cityworld.info, .teleport, .find, .schematic, .export), so LuckPerms — or any NeoForge permissions manager — can hand out finding and world-jumping without handing out schematic pasting. With no permissions manager installed nothing changes: the defaults are the operator levels the commands always used.

→ Every command with usage examples: sablecraft.co.uk/cityworld-reforged

Requirements

CityWorld runs on six Minecraft versions, across two loaders. Download the file for yours — the Minecraft version is in the filename, so there is no guessing which is which.

A given seed builds the same city on all six. The layout — terrain, roads, districts, which building stands where — is identical across versions; only the materials shift slightly, because newer Minecraft versions bring new blocks into the building palettes. Every version is verified automatically before release, generating a real world and checking the cities, signs and biomes come out right.

Credits and licence

CityWorld is licensed under GPL-3.0-only.

• Original CityWorld Bukkit plugin by DaddyChurchill — the original author knows about this port and has approved it.
• This NeoForge port — and the 1.20.1 Forge build — by Sablednah, continuing under GPL-3 as a derivative work.
• Terrain noise vendored from Bukkit (GPL-3), in turn derived from Stefan Gustavson's public-domain simplex work.

Full docs, screenshots and guides: sablecraft.co.uk/cityworld-reforged Source, issue tracker and full port history: see the GitHub repository.