5. Mexico: Dia de Los Muertos.
Perhaps the most widely celebrated variation of All Saints’ Day in the United States, Dia de Los Muertos, or Day of the Dead, honors and celebrates deceased loved ones. With roots in both traditional Aztec culture and in Spanish Christian culture, Dia de Los Muertos is one of the most popular holidays in Mexico. Traditions vary by region, but often involve the construction of an elaborate altar in the home.