Underground Library

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“This is Acidicus. He runs our library.”

— Skales to Kai, Jay, and Cole

The Underground Library is a library in one of the Serpentine Tunnels, inhabited by the Serpentine in the Ninjago City Sewers.

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Planet Earth
Landmarks	Alcatraz · Amusementland (Cranium Shaker · Haunted House of Horrors · Hell's Gate) · Anacondrai Tomb · Badlands · Birdmingham Desert · Birdmingham Desert Island · Bridge of Fallen Mentors · Birchwood Forest · Blackwood Forest · Bottomless Pit · Briny Beach · Caligari Carnival · Canyon of General Unhappiness · Caves of Despair · Celestial Clock · Cell One · Chen's Camp · Chen's Island · Chronicle Cave · Cobalt Plateaus · Constrictai Tomb · Corridor of Elders · Cove of Crystal Waters · Dark Island · Deluxe Cell · Desert of Doom · Desert Pyramid · Digger's Deep · Dungeons of Shintaro · Dyer Island · Echo Canyons · Endless Jungle · Endless Sea · Fangpyre Tomb · Field's Train Station · Finite Forest · Firing Room · Fisherman's Wharf · Floating Ruins · Forest of Tranquility · Frozen Wasteland · Fowl Fountain · Gas Station · Geckle Strong-Cave (Courthouse · Mino Pit · Safe Haven · Story Cave) · Gentle Cove · Glacier Barrens · Glacier Island · Golden Gate Bridge · Golden Peaks · Grief-Bringer's Tomb · Hall of Mirrors Cave · Hangar Bay · Haunted Hill · Hidden Workshop · Highway 1 Country Fair (Alien Abduction · Zero Gravity) · Hinterlands · Hiroshi's Labyrinth (Oasis · Stronghold) · Hollow's Bluff · Hypnobrai Tomb · Ice Fortress · Ignacia · Isla Sorna · Isles of Sunseto · Jankikai Jungle · Jungle of Lost Souls · Kethanol Geyser · Library of Records · Lil' Critters Petting Zoo · London Eye · Mega Monster Amusement Park (Beastyburger · Ghost Train · Monstertiki · Whack a Snake) · Mount of Eternal Shadows · Mountain of a Million Steps · Mountains of Impossible Height · Mortmain Mountains · Munce Home-Cave (Arena · Armory · Story Cave · Throne Room) · Nevermore Tree · Ninja Tent · Ninjago Beach · Ninjago City Park · Ninjago City Sewers · Ninjago Harbor · Ninjago Island · Ninjago Sky · No Man's Bluff · Oceanside Pier · Pier 39 · Plainview Heights Country Club · Plainview Municipal Pool · Puddlelands · Ramen Vendor · Reboot Activation Port · Repo Yard · Rock-Bottom · Route 23 · Samurai X Cave · Scattered Canyon · Sea of Sand · Serpentine's Underground Fortress · Serpentine Mines · Serpentine Tunnels · Serpentine Valley · Shintaro Caves · Shintaro Mines · Shintaro Mountain · Slingshot Woods · Skulkin Mines · S.O.G. Headquarters · South Beach · Spinjago · Spirit Coves · Squalor Penthouse · Stone Army Tomb · Straits of Tropicana · Strangler's Path · Temporal Vortex · Tomb of the First Spinjitzu Master (Grave · Maze · Waterfall) · Torchfire Mountain · Toxic Bogs · Underground Library · V.F.D. Tunnels · Venomari Tomb · Vermillion Swamps · Volcano Lair · Wailing Alps · Well of Souls · West El Paso Current · Wildwood Forest · Yeti Cave Outer Space: Moon · Sun
Buildings	667 Dark Avenue · Abandoned Arcade · Abandoned Warehouse · Admiralty Arch · Alcatraz Prison · Ancient Pyramids · Armoracia · Benny's Arcade Emporium · Big Ben · Biker Tavern · Borg Tower (Vaults) · Borg Store · Buckingham Palace · Buddy's Pizza · Budville Trading Company · C'boath Bar · Castillo de San Marcos · Chan's Theater · Chen Monastery · Chen's Noodle Factory · Chen's Noodle House · Chen's Palace · Club Obi Wan · Coit Tower · Concert Hall · Corny's Family-Style Restaurant · Cranium Shaker · Crystal Cove Studio · Dareth's Apartment · Dareth's TV Studio · Darkley's Boarding School · Desert Shrine · Dragon's Forge · Dyer Apartment · Ed & Edna's Scrap N Junk · Ellis Island · Explorers Club (Artifact Room · Entomology Room) · F-F-Fearatorium Food Emporium (Set) · Firehouse Saloon · Forsaken Citadel (Dungeon · Lookout · Throne Room) · Forsaken Pyramid (Boobytrapped Stairs · Crypt · Mural · Spikes · Swaying Bridge) · Four Weapons Blacksmith · FurMart · Garbage Depot · Garmadon Monastery · Grand Sensei Dareth's Mojo Dojo · Heimlich Hospital · Hero's Suite · Herring Houdini · In Chic Hat Salon · Jamanakai Village Inn · Juice Shack · Kiddie Arcade · Kryptarium Prison · Last Chance General Store · Laughy's · Leisure Village · Lloyd's Treehouse Fortress · Library of Domu · Library of Hono Mizu · London Gherkin · Lucky Smells Lumbermill · Marty Oppenheimer School of Performing Arts · Monastery of Spinjitzu · Mr. Liu's Relic Shop · Mulctuary Money Management · Murnau Cinema · Museum of Natural History (D · H · Hall of Villainy) · Mystake's Tea Shop · Nang Tao Airport · Ninjago City Aquarium · Ninjago City Cinema · Ninjago City Hospital · Ninjago City Bank · Ninjago City Hall · Ninjago City Police Station · Ninjago City Power Station · Ninjago Doomsday Comix · Ninjago Fried Chicken · Ninjago Metro (Track 9) · Ninjago Petrol · Ninjago Supreme Court · Old Electronics Warehouse · Oni Temple · Palace of Secrets · Paltryville Barber Shop · Paltryville General Store · Paltryville Hardware & Locksmith · Paltryville Optometry · Panda Power · Plainview Mall · Player Expo · Prufrock Preparatory School · Quest Research Laboratories · Rocket Rollers Roller Rink · Ronin's Coffee Shop · Ronin's Pawn Shop · Royal Palaces · Saint Paul's Cathedral · Sanctuary of Stiix · Scott's Garage · International Schools · Shintaro Palace (Palace Gardens · Throne Room) · Smith Daryll's Used Car Lot · Smugglers' Market · Spag Union Preparatory School · Statue of Liberty · Steep Wisdom · Steeper Wisdom · Storm Farms · The Vogue · Tower Bridge · V.F.D. Church · V.F.D. Feed · V.F.D. Gas Station · V.F.D. Town Hall · V.F.D. Uptown Jail · Veblen Hall · Vermillion Dome of Doom · Wind Farms Power Station · Wong's Costume · Yang Tavern
Bodies of Water	Black River · Boiling Sea · Catamaran Sea · Frozen Ice Pond · Lake Lachrymose · Oasis · Pacific Ocean · Rappahannock Lake · River of Darkness · Stricken Stream
Castles	Mystery Castle
Cities/Towns	Chicago · Domu · Floating City · Gongmen City · Green Lake · Heartlake City · Hono Mizu · Ivory City · Lachrymose · London · Los Angeles · Metalonia · New York City (Financial Center) · Ouroboros · Paltryville · Plainview · Porto Corsa · Radiator Springs · San Dimas · San Francisco · Shanghai · Shintaro City · Stiix · Tanis · Tianjin · Tokyo
Countries	Europe: Albania · Austria · Belarus · Belgium · Bulgaria · Czech Republic · Denmark · Estonia · Finland · France · Germany · Greece · Hungary · Iceland · Ireland · Italy · Latvia · Liechtenstein · Lithuania · Luxembourg · Moldova · Monaco · Montenegro · Netherlands · Norway · Poland · Portugal · Romania · San Marino · Slovakia · Spain · Sweden · Switzerland · Ukraine · Vatican Africa: Egypt · Gambia Asia: Afghanistan · Armenia · Azerbaijan · Bahrain · China (Republic) · Georgia · India · Iran · Iraq · Israel · Jordan · Kazakhstan · Kuwait · Kyrgyzstan · Lebanon · Oman · Saudi Arabia · Syria · Tajikistan · Turkmenistan · Uzbekistan · Yemen Oceania: Australia · Fiji · Guam · Western Samoa South America: Argentina · Bolivia · Brazil · Chile · Colombia · Ecuador · Falkland Islands · French Guiana · Guyana · Paraguay · Peru · Suriname · Uruguay · Venezuela North America: Antigua · Aruba · Barbados · Barbuda · Belize · Canada · Costa Rica · Cuba · Dominica · Dominican Republic · El Salvador · Grenadines · Guadeloupe · Guatemala · Haiti · Honduras · Jamaica · Martinique · Mexico · Nicaragua · Panama · Puerto Rico · Saint Lucia · Saint Vincent · United States of America Multiple Continents: Cyprus · Russia · Turkey Former Countries: Czechoslovakia (Czech Republic · Slovakia) · Nazi Germany · Soviet Union (Armenia · Azerbaijan · Belarus · Estonia · Georgia · Kazakhstan · Kyrgyzstan · Latvia · Lithuania · Moldova · Russian Federation · Tajikistan · Turkmenistan · Ukraine · Uzbekistan) · Yugoslavia
Houses	Anwhistle House · Count Olaf's House · First Spinjitzu Master's House · Justice Strauss's House · Montgomery House · Pfeifer House · Poe House · Roise's House · Scoggins House · Wade House
Mansions	Baudelaire Mansion · Darrow Mansion · Dyer Mansion · Gordon Estate (Bedrooms) · Jackson Mansion · Potter Mansion · Quagmire Mansion
Provinces	Fujian · Guangdong · Hebei · Pankot · Sichuan
States	Alabama · Alaska · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · Florida · Georgia · Hawaii · Idaho · Illinois · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Montana · Nebraska · New Hampshire · New Jersey · New Mexico · New York · Nevada · North Carolina · North Dakota · Ohio · Oklahoma · Oregon · Pennsylvania · Rhode Island · South Carolina · South Dakota · Tennessee · Texas · Utah · Vermont · Virginia · Washington · West Virginia · Wisconsin · Wyoming
Temples	Fire Temple · Hanging Temple · Heart of the Mountain · Monk's Temple · Skull Keep · Temple of Airjitzu · Temple of Fortitude · Temple of Fragile Foundations · Temple of Light · Temple of Resurrection
Towers	Borg Tower (Vaults) · Coit Tower · Treacherous Tower
Villages	Canal Village · Jamanakai Village · Keepers' Village · Saint Nelson's Village · Village of Fowl Devotees
Maps	Map of Dens · Map of Fangs · Map of the Golden Weapons · Map of the Oni Masks
Religions	Christianity · Islam · Judaism
Shows	Fred Finely Live At Five · Most Ultimate Extreme Ninja Challenge Ever · Ultra Hunt Events: Dragon Hunts