Disneyland is a theme park at the Disneyland Resort in Anaheim, California. It was the first theme park opened by The Walt Disney Company and the only one designed and constructed under the direct supervision of Walt Disney, and opened on July 17, 1955.

The first Disneyland—and the only one personally designed and built under the direct supervision of Walt Disney—is Disneyland Park in Anaheim, California, which opened on July 17, 1955. Known as "The Original," it was a revolutionary concept that birthed the modern theme park industry. The opening day was famously nicknamed "Black Sunday" because of numerous logistical disasters, including counterfeit tickets that led to massive overcrowding, fresh asphalt that trapped women's high heels, and a lack of working water fountains. Despite these early hiccups, the park became a global icon, eventually expanding into the two-park "Disneyland Resort" we know today. It is important not to confuse it with Walt Disney World in Florida, which didn't open until October 1971, six years after Walt's death. The Anaheim park is often called "Walt's Park" and remains unique for its intimate scale and the fact that Walt Disney himself had a private apartment above the Firehouse on Main Street, where a lamp is still kept lit in the window to signify that his spirit is always "home."