|The Yellow Castle' from 1978.|
|This image is used here by permission of Brickset. All other rights reserved.|
The Yellow Castle - officially Castle (375/6075)  - was a set released in 1978 and has come to be seen as a defining moment in LEGO history with collectors and general fans who were children in the late 70's and early 80's paying large sums to obtain an original copy.
The set designer was Daniel Krentz.