In WikiSpeak, a '''crystal palace''' is a page or set of pages which, having achieved a level of perfection, are no longer active nor living.
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CrystalPalace is the name of a location in LondonTown.

There was once a 'palace' there, actually a rebuild of the exhibition hall from the Great Exhibition of 1851, rebuilt on a hill in south London and burned down in 1934.

There is now a large park with an athletics stadium, a railway station and a London suburb.  Also a TV tower visible for miles around.
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See TheWikiPlateau