Where Eagles Dare (1968)

The 1968 British war adventure stars Richard Burton and Clint Eastwood as Allied agents. They portray Major John Smith and Lieutenant Morris Schaffer, respectively, on a mission to rescue an American general held captive in a Nazi fortress.

The fictional castle in the film is called the Schloss Adler, or "Eagle's Castle," located high in the Bavarian Alps. The production used miniature effects for the distant castle shots, while the interior sets were built at MGM's British studios in Borehamwood.

Yes, Scottish author Alistair MacLean wrote the screenplay for the film and concurrently wrote the novel of the same name. The book was actually published a year after the movie's 1968 release, which is a rare sequence of events for a film adaptation.

While the story is set in Bavaria during World War II, the mountain and snow scenes were filmed on location in Werfen, Austria. The production also shot scenes at the nearby RAF Bovingdon airbase in Hertfordshire, England.