February 17 is Mardi Gras, or “Fat Tuesday,” traditionally a Catholic holiday that celebrates the last night of indulging in guilty pleasures before participating in the penitential season of Lent. Celebrated around the world with elaborate parties, parades, dancing, and other frivolities, its festivities are most famously celebrated within the United States today in the city of New Orleans, Louisiana, the site of the first American Mardi Gras.