Following Walt Disney's death in December 1966, Disneyland entered a period of transition and steady expansion led by his brother, Roy O. Disney. Roy postponed his retirement to ensure Walt's grandest projects were completed "exactly the way Walt wanted." In the years immediately following 1966, Disneyland saw the opening of some of its most iconic attractions that Walt had been developing, including Pirates of the Caribbean (1967) and the Haunted Mansion (1969). The park continued to focus on the "Tomorrowland" expansion and the introduction of more sophisticated animatronics. Simultaneously, the company’s focus was split between maintaining the original park and constructing the massive "Disney World" project in Florida, which opened its first park, the Magic Kingdom, in 1971. This era solidified the philosophy that "Disneyland will never be completed," as the team of Imagineers proved they could carry on Walt's creative legacy through a period of immense grief and corporate uncertainty.