The castle in Act 2 could look like this. Spiral staircase leading to the "stage" where princess, prince, and Rusalka have their quarrel. Rusalka runs down the steps to the fishpond. Castle is located up high near the moon to imply that being with the prince is a far-fetched dream.
The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005) starring William Moseley, Anna Popplewell, Skandar Keynes, Georgie Henley, Tilda Swinson, Liam Neeson, James McAvoy, Jim Broadbent and Ray Winstone