Where was One Flew Over the Cuckoo's Nest filmed

Film was filmed primarily on location in Oregon, which gave it an authenticity rarely seen in Hollywood productions of that era. The story follows Randle McMurphy, a criminal who fakes insanity to serve his sentence in a mental institution rather than a prison work farm. Once inside, he clashes with the tyrannical Nurse Ratched and gradually inspires the other patients to assert themselves. The production used a real psychiatric hospital as its primary filming location, with actual patients sometimes appearing as extras. The cast includes Jack Nicholson in one of his most iconic roles, alongside Louise Fletcher, Danny DeVito, Christopher Lloyd, and Brad Dourif. The film swept all five major Academy Awards — Best Picture, Best Director, Best Actor, Best Actress, and Best Adapted Screenplay — becoming only the second film in history to achieve that feat. Based on Ken Kesey's 1962 novel, the adaptation was produced by Michael Douglas and Saul Zaentz.