To begin with, Disneyland was the world's first theme park, drastically elevating the seediness of carnivals and cheap amusement parks of the day to a warm, clean and friendly setting. Disneyland is home to the world's first tubular steel roller coaster, Matterhorn Mountain.

When Disneyland opened in 1955, it was revolutionary because it was the world's first true "theme park," rather than a simple amusement park. Before Disneyland, parks were often dirty, temporary collections of random rides; Walt Disney introduced the concept of "immersive storytelling," where every land (Frontierland, Tomorrowland, etc.) was a cohesive world with its own architecture, music, and "cast members." It was also a massive business gamble that leveraged the power of television—the "Disneyland" TV show acted as a year-long commercial for the park before it even opened. By blending science (Imagineering) with cinematic storytelling, Disneyland became a global ambassador for American creativity, proving that families would pay for a clean, safe, and narratively driven "vacation destination" rather than just a day of rides.