A Streetcar Named Desire Posters
Belle Reve is the name of the estate that Blanche and Stella DuBois come from in Tennesse Williams's "A Streetcar Named Desire". Throughout the play, Blanche gradually becomes insane. In Smallville, Belle Reve is the name of a mental hospital.

The main reason it's connected to Superman and get's recognition here is that it's main star was Marlon Brando aka Jor-El Superman's father from the Superman movie.