Disney Fun Facts & Insider Secrets. #1 – Fun Facts About Cinderella’s Castle: Cinderella’s Castle is 189 feet tall and has 18 towers and 13 gargoyles. With an exterior made of fiberglass, Cinderella’s Castle is the tallest building at Magic Kingdom. #2 – Fun Facts About Space Mountain: The 2 roller coasters in Space Mountain rise to a height of 92 feet.