The National Film Registry annually selects 25 films that it has deemed "culturally, historically, or aesthetically significant" enough to be preserved in the Library of Congress. With over 100 years of film to choose from, the Library of Congress has selected Wes Anderson's Rushmore, Rob Reiner's The Princess Bride, Alfred Hitchcock's The Birds, and Disney's animated classic The Lion King for the honor this year.
Other films added to the collection include The Atomic Cafe (1982), Ball of Fire (1941), The Beau Brummels (1928), Blackboard Jungle (1955), The Breakfast Club (1985), The Decline of Western Civilization (1981), East of Eden (1955), Funny Girl (1968), Life of an American Fireman (1903), Lost Horizon (1937), The Musketeers of Pig Alley (1912), Paris is Burning (1990), Point Blank (1967), Putney Swope (1969), the films of Solomon Sir Jones (1924-1928), Steamboat Bill, Jr. (1928), Suzanne, Suzanne (1982), Thelma & Louise (1991), 20,000 Leagues Under the Sea (1916), A Walk in the Sun (1945), and Who Framed Roger Rabbit? (1988).
More information about the films, including descriptions, essays, and the rest of the collection, can be found on the National Film Preservation Board's website here.