Actor Ronald Reagan attends the opening day of Disneyland in Anaheim, Calif. (Earl Leaf/Michael Ochs Archives/Getty)
Actor Steve Rowland and actress Kathleen Case pose as they play arcade movies during the opening day of Disneyland in Anaheim, Calif. (Earl Leaf/Michael Ochs Archives/Getty)
Walt Disney sits on a rock in front of the Sleeping Beauty Castle in the Fantasyland section of Disneyland on opening day of the amusement theme park in Anaheim, Calif. (Photo/AP)
Actor Steve Rowland and actress Kathleen Case and Adelle August pose as they play arcade games during the opening day of Disneyland in Anaheim, Calif. (Earl Leaf/Michael Ochs Archives/Getty)
People fill in the Disneyland amusement park on its opening day in Anaheim, Calif., on July 17, 1955. (Photo/AP)
In this Sunday, July 17, 1955 file photo, children sprint across a drawbridge and ithe castle that marks the entrance to Fantasyland at Disneyland in Anaheim, Calif. (AP)
Gov. Goodwin J. Knight, Walt Disney, Fred G. Gurley, President of Santa Fe Railroad, right, take a ride around Disneyland in Anaheim, Calif. July 17, 1955. (Photo/AP)
In this handout file photo from Disneyland, Walt Disney poses with the first two visitors, Michael Schwartner, 7, left, and Christine Vess, 5, right, on the park's opening day. (Photo/AP)
Actor Steve Rowland and actress Kathleen Case and Adelle August pose as they walk through the park during the opening day of Disneyland in Anaheim, Calif. (Earl Leaf/Michael Ochs Archives/Getty)
This aerial view shows Disneyland as 22,000 invited guests attend opening day festivities of the amusement park in Anaheim, Calif., on July 17, 1955. (Photo/AP)
Actress Adelle August poses as she rides on Autopia during the opening day of Disneyland in Anaheim, Calif. (Earl Leaf/Michael Ochs Archives/Getty)
Gov. Goodwin J. Knight, left, Walt Disney, right, and Virginia Knight, wife of the governor, take a ride in an antique-styled automobile at Disneyland near Anaheim, Calif. (AP)