The Magic Kingdom is a theme park at the Walt Disney World Resort. The first park built at the resort, it opened on October 1, 1971. The park saw an estimated 17 million visitors in 2008, making it the most visited theme park in the world. Designed and built by WED Enterprises (now known as Walt Disney Imagineering), the park's layout and attractions are similar to Disneyland Park in Anaheim, California.