atlantis(n = noun.cognition) - according to legend, an island in the Atlantic Ocean that Plato said was swallowed by an earthquake;
is a kind of fictitious place, imaginary place, mythical place

N  imagination, originality, invention, fancy, inspiration, verve, warm imagination, heated imagination, excited imagination, sanguine imagination, ardent imagination, fiery imagination, boiling imagination, wild imagination, bold imagination, daring imagination, playful imagination, lively imagination, fertile imagination, fancy, mind's eye, such stuff as dreams are made of, ideality, idealism, romanticism, utopianism, castle-building, dreaming, phrensy, frenzy, ecstasy, extasy, calenture, reverie, trance, day dream, golden dream, somnambulism, conception, Vorstellung, excogitation, a fine frenzy, cloudland, dreamland, flight of fancy, fumes of fancy, thick coming fancies, creation of the brain, coinage of the brain, imagery, conceit, maggot, figment, myth, dream, vision, shadow, chimera, phantasm, phantasy, fantasy, fancy, whim, whimsey, whimsy, vagary, rhapsody, romance, gest, geste, extravaganza, air drawn dagger, bugbear, nightmare, flying Dutchman, great sea serpent, man in the moon, castle in the air, pipe dream, pie-in-the-sky, chateau en Espagne, Utopia, Atlantis, happy valley, millennium, fairyland, land of Prester John, kindgom of Micomicon, work of fiction, Arabian nights, le pot au lait, dream of Alnashar, illusion, phantom, Fata Morgana, vapor, stretch of the imagination, mythogenesis, idealist, romanticist, visionary, mopus, romancer, dreamer, somnambulist, rhapsodist, castle-buildier, fanciful projector, imagined, ben trovato, air drawn, airbuilt, imagining, imaginative, original, inventive, creative, fertile, romantic, high flown, flighty, extravagant, fanatic, enthusiastic, unrealistic, Utopian, Quixotic, ideal, unreal, in the clouds, in nubibus, unsubsantial, illusory, fabulous, legendary, mythical, mythic, mythological, chimerical, imaginary, visionary, notional, fancy, fanciful, fantastic, fantastical, whimsical, fairy, fairy-like, gestic, a change came o'er the spirit of my dream, aegri somnia vana, dolphinum appingit sylvis in fluctibus aprum, fancy light from fancy caught, imagination rules the world, l'imagination gallope, le jugement ne va que le pas, musaeo contingens cuncta lepore, tous songes sont mensonges, Wahrheil und Dichtung, DIVISION II COMMUNICATION OF IDEAS.