castle in the air

Noun

 * 1)  A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

Usage notes
Completing the metaphor, one is said to or.

Translations

 * Albanian: kështjella në erë, ëndrra në diell
 * Catalan: castells en l'aire
 * Chinese:
 * Mandarin:
 * Czech: vzdušné zámky
 * Danish: luftkastel
 * Dutch:
 * Esperanto: aerkastelo, ĥimero
 * Faroese: harraborg, skýborg
 * Finnish: ,
 * French:
 * Galician: castelos no ar
 * German: ,
 * Hebrew:
 * Hungarian:
 * Maori: waitara
 * Norwegian:
 * Bokmål:
 * Nynorsk: luftslott
 * Portuguese: castelo de vento, castelo no ar
 * Russian:
 * Serbo-Croatian:
 * Cyrillic: куле у зраку
 * Roman: kule u zraku
 * Spanish: castillos en el aire, castillos de naipes
 * Swedish: