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Appearance
Surroundings: Windmills or solar panels or salt ponds or algae lakes for power or fuel generation
Surface: Organic coral or flesh or vegetal coating giving citadel natural appearance
Additional features: Dueling common but possibly illegal, diminishes elites constantly
Event: Secret society seek to spy on and kill strangers Sublevels
Storage: Storage lockers rented for citizens personal storage needs
Greenhouse: Culture farm where huge vats of bacteria and yeast bubble constantly
Catacomb: Piles of bones often arranged in macabre stacks
Power station: Solar battery supplied by conversion ells on citadel surface
Midlevels
Middle housing: Family and extended clan communes with shared enclosed spaces
Middle housing: Modular living habs built in stacks in huge clusters like giant children’s blocks
Middle housing: Large courts with fine houses separated with gatehouses and gatekeepers who limit access
Stadium: Park with obstacle course and playground equipment for adults and children
Greenhouse: Monoculture of single crop with specialized tools and chemicals and labour
Greenhouse: Wild greenhouse of savage ecology mobile plants or fungi
Manufacturing: Industrial factory with rows of workers tending machines in unison
Library: Scrolls kept in tubes in collections in huge shelves
Library: Crumbling mess of damaged books, rotting shelves with no organisation and vermin
Stadium: Race track for vehicles (like chariots or jetbikes) or beasts
Greenhouse: Aquaculture farm with fish, eels, lampreys and shellfish grown in tanks
Church: A monumental scale work of devotional artwork such as a huge statue or stained glass
Greenhouse: Wild greenhouse of savage ecology mobile plants or fungi
Upper Levels
Church: A cathedral with room for up to a thousand with many chambers, staff and artworks
Church: An abandoned shrine to a long lost cult mostly dust covered
Church: A small church with room for a dozen worshipers and accommodation for holy teacher
Palace: Ruined ancient palace long sealed with unwelcome animals and monsters
Stadium: Race track for vehicles (like chariots or jetbikes) or beasts
Middle housing: Modular living habs built in stacks in huge clusters like giant children’s blocks
Merchant: General stores with clutters of goods and crotchety old shopkeepers
Church: A tiny shrine with idols, simple stone slab altar or artwork in a niche or small room
Stadium: Rings for wrestlers, martial artists and duellists for training and public sport
Middle housing: Large courts with fine houses separated with gatehouses and gatekeepers who limit access
Library: Ancient AI brain with huge data bases and programmer priests
Church: A hidden shrine with disguised entrance to secret cult chamber
Crowning Feature
Colossal super weapon for siege an or air defence, keep all in fear (nonfunctional, not repairable)