If you’re a Disney history fan, then Walt Disney’s Carousel of Progress in Tomorrowland is a must-visit. This rotating theatre show features how technology developed throughout the 20th century. It first opened at the 1964 World’s Fair then was in Disneyland until it found its home at the Magic Kingdom. And ever since its debut over 50 years ago, the song "There's A Great Big Beautiful Tomorrow" has been getting stuck in heads.