3 Disney parks to open for 24 hours for "Monstrous Summer" day

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ORLANDO, Fla. - Disney officials unveiled Thursday new additions to Magic Kingdom's Fantasyland.

 The expansion at Fantasyland doubled the size of the park and will include the Princess Fairytale Hall, the Fantasy Forest and Seven Dwarfs Mine Train roller coaster.

"We do that by using a mine car train that swings back and forth that will allow you to feel every twist and turn as you journey through the mines," said Pam Rawlin, Disney Imagineering.

Disney said the expansion will help make guests feel like a Disney movie character.

Thursday night, officials announced three parks will be open for 24 hours starting May 24 at 6 a.m. until May 25 at 6 a.m. to kick off "Monstrous Summer," which promotes Pixar's Monster's University film set to come out this summer.

At Princess Fairytale Hall, guests will be able to meet all of the Disney princesses.

"You don't have to hunt around the park for them or go on a goose chase or a princess chase or whatever you want to call it. You’ll be able to go here and see the princesses and meet with them," said spokesman Jason Grant.

The hall, which opens later this year, will have a different feel and look than Cinderella's Castle.

"Just like you've gone to a palace, a real palace -- there's beautiful wood finishes, castle walls, really lush draperies," said Grant.

The Fantasy Forest and Seven Dwarfs Mine Train roller coaster are set to open in 2014.

"It will be those rolling hills and the vegetation in which they mined," said spokesman Mark Kohl.

The roller coaster's cars will be taken straight from the Disney classic "Snow White and the Seven Dwarfs."

"You're going to experience seven of our closest friends hard at work on millions of diamonds and gems, and that's exciting," said Kohl.

Kohl said guests will be able to walk 360 degrees around the roller coaster.

The addition is costing $425 million. Once it's complete, Disney said it will add 800 jobs.