Classic western Butch Cassidy and the Sundance Kid is one of 25 films that have been added to the Library of Congress' National Film Registry.
Robert Redford starred in the iconic western
The western, which stars Robert Redford and Paul Newman, headed a list that also included a documentary about giraffes and the 1970 war film Patton.
The most recent movie in the list was Tin Toy, a short film by Toy Story makers Pixar in 1988.
The new entries bring the library's list of landmark films to 375.
It includes the 1894 film by WKL Dickson, which was the first attempt to synchronise moving images with sound.
And less well-known titles also feature, such as The Chechahcos - a black and white silent film made in 1924. It was the first movie made in Alaska.
A 1928 Fox Movietone reel about a travelling black band from South Carolina, the Jenkins Orphanage Band, also made it onto the list.
Other better-known films included Mel Brooks' 1974 comedy horror Young Frankenstein, 1944's National Velvet - which starred a young Elizabeth Taylor - and White Heat, a 1949 gangster film which starred James Cagney.
The registry was set up in 1989 to help protect important movies from damage.
The films are chosen by the National Film Preservation Board, consisting of film historians, academics, studio executives and critics.