The chronicles of Narnia. The lion, the witch and the wardrobe
Peter, Susan, Edmund, and Lucy decide to play hide-and-seek, and during the game Lucy discovers a mysterious wardrobe. She tucks herself inside and backs to the rear of the cabinet, there she finds herself in an entirely different world. The place is called Narnia, and it's been locked in winter for over 100 years by someone known as "The White Witch."