National Bundt Day is observed worldwide on November 15 each year, celebrating the popular Bundt cake and its distinctive doughnut shape created by the Bundt pan. This holiday was established by Nordic Ware in 2006 to commemorate the company's 60th anniversary and marks the start of the holiday baking season leading up to Thanksgiving. The Bundt pan, inspired by the traditional Gugelhupf cake, was designed by H. David Dalquist and gained popularity in the United States after Ella Helfrich's "Tunnel of Fudge" cake won second place in the 1966 Pillsbury Bake-Off. On National Bundt Day, people are encouraged to bake Bundt cakes using various recipes and share them with family and friends, often posting photos on social media with the hashtag #NationalBundtDay.