Discover the magic of the Marauder's Map. When the coasters are at room temperature, they appear blank. When the cold of your drink comes into contact with it, the Marauder's Map slowly appears, revealing various parts of Hogwarts Castle.

Harry Potter is a fantasy literary series written by British author J. K. Rowling, whose novel sequel was completed in 2007. The seven-novel series follows the adventures of a young wizard named Harry Potter and his friends Ron Weasley and Hermione Granger at Hogwarts School of Witchcraft and Wizardry, headed by Albus Dumbledore.