Disneyland in Anaheim, California, was the first of the two to open, welcoming its first guests on July 17, 1955. It was the only theme park designed and built to completion under the direct supervision of Walt Disney himself. Walt Disney World in Orlando, Florida, opened its doors significantly later, on October 1, 1971, beginning with the Magic Kingdom, Disney's Contemporary Resort, and Disney's Polynesian Village Resort. Walt Disney passed away in 1966, five years before the Florida park opened, though he was instrumental in the "Florida Project" and the secret land acquisitions that made it possible. In 2026, Disneyland remains the historic "original" experience, while Disney World has grown into a massive vacation destination spanning nearly 40 square miles, featuring four theme parks, two water parks, and over 25 themed resort hotels.