Where Eagles Dare (1968)
Directed by: Brian G. Hutton
Cast: Richard Burton, Clint Eastwood, Mary Ure
IMDb page about Where Eagles Dare
Studio(s): MGM Borehamwood
Trailer:
Castle
The Scholss Adler (castle) was a huge scale model built on the MGM British backlot, seen in the photo below.
More photos of the Where Eagles Dare model and other MGM Backlot scenes