The first Disney theme park was Disneyland, which opened in Anaheim, California, on July 17, 1955. It was the only park designed and constructed under the direct personal supervision of Walt Disney himself. Built on 160 acres of former orange groves, it cost roughly $17 million and was financed in part through a groundbreaking deal with the ABC television network. On its opening day—famously known as "Black Sunday"—the park was overwhelmed by double the expected crowd, many using counterfeit tickets. Despite the melting asphalt and plumbing strikes of day one, Disneyland redefined the amusement park industry by shifting from "dirty carnivals" to a clean, safe, and "themed" environment divided into iconic lands like Fantasyland, Adventureland, and Tomorrowland. In 2026, it remains the "gold standard" for theme park design, having served as the blueprint for every subsequent Disney park in Florida, Tokyo, Paris, Hong Kong, and Shanghai.