Which of the Smithsonian museums has Judy Garland's shoes from the Wizard of Oz and other movie props?

I'm going to visit the Smithsonian with my school this week. We leave for Washington D.C. tomarrow morning. And I'm really interested in the entertainment stuff in the Smithsonian, like the ruby slippers Judy Garland wore in the Wizard of Oz, and other stuff related to entertainment, like Will Roger's rope he used on stage during his performaces (im a distant cousin of his). Do u know what museum this stuff could be found in, and in what exhibit?