From the Greek word Apocrypha which means 'hidden things'. Slang term derived from the Apocryphical Books of the Bible. In daily speech, "Apocrypha" and "apocryphal" means something that is not canonical, something that doesn't really count. Often used by comic book or tv-show geeks.
Nah -- Spock never visited Never-Never Land in current Star Trek continuity. That episode is totally apocryphal.
(Note that the example itself is apocryphal and not taken from neither the real world nor Star Trek lore.)
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.