castle in the air

noun

a fanciful or impractical notion or hope; daydream.

Also called air castle, castle in Spain.

Origin:
1570–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Castle in the air is always a great word to know.

So is flibbertigibbet. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a chattering or flighty, light-headed person.

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Collins

World English Dictionary

castle in the air or castle in Spain

—n
	a hope or desire unlikely to be realized; daydream

castle in Spain or castle in Spain

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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"The New Testament is an invaluable book, though I confess to having been slightly prejudiced against it in my very early days by the church and the Sabbath-school, so that it seemed, before I read it, to be the yellowest book in the catalogue. Yet I early escaped from their meshes. It is hard to get the commentaries out of one's head and taste its true flavor.... It would be a poor story to be prejudiced against the Life of Christ because the book has been edited by Christians. In fact, I love this book rarely, though it is a sort of castle in the air to me, which I am permitted to dream."

-Henry David Thoreau