Brickset member bricknation delivers the scoop again by discovering a model of Neuschwanstein Castle in the background of a photo from the manual of 21010 Robie House. Could this be a prototype for a future LEGO architecture set? Since this photo is from the manual of the Robie House set that was available for purchase at the LEGO Discovery Center, I'm considering it released information and not pre-release, until TLG convinces us otherwise.
You may recognize the castle as it has been the subject of several great MOCs due to its visually stunning architecture.
Update: ibes007 has identified the model as a non-LEGO model that was available for retail, and it does seem to be the case. Quite an interesting gaffe for it to show up in a LEGO manual.
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