When Disney World opened in 1971, Orlando was a relatively small town. But Disney World attracts more than 52 million visitors annually, making it the most popular theme park in the world. Orlando has boomed in growth ever since. | When Disney World opened in 1971, Orlando was a relatively small town. But Disney World attracts more than 52 million visitors annually, making it the most popular theme park in the world. Orlando has boomed in growth ever since. |