Dia de los Muertos, or Day of the Dead, is one of the most unique holidays in the world. Originating in Mexico, it is a celebration of the lives of those who have passed, and an invitation for them to return to visit for a day. More recently, it has become an American pop culture obsession. Want to join in on the celebration? Enjoy this handy DIY make-up tutorial on calavera, or skull, make-up applications.