National Museum of American History, Washington D.C., USA - The National Museum of American History, which is part of the Smithsonian Institute in Washington D.C. will be showing ride cars from "Dumbo the Flying Elephant" and the "Mad Hatter's Tea Party." Both of these rides debuted in Disneyland’s opening year in 1955. The two cars will go on display starting June 9th at nine a.m. at the museum's West corridor If you do go see the exhibit, we recommend you take the metro to the Smithsonian stop, because D.C. traffic can be a mess.