This disturbing film, which Lynch still has yet to explain became recognized by the United States Library of Congress as a "culturally, historically, or aesthetically significant" film in 2004 and is now preserved in the National Film Registry.
Interesting Fact: -"The mutant baby was apparently created from the embalmed fetus of a calf. After completing the film, Lynch reportedly buried the "Embalmed Calf" in an undisclosed location."
*info taken from Imdb