Smooth, strong and utterly unique, the legendary amber liquor known as Jack Daniels is one of the worlds best selling whiskies. And every single bottle is made in just one place - tiny Lynchburg, Tennessee. National Geographic goes inside the factory where tradition and technology intersect to make 150 million bottles of Jack Daniels Old No. 7 each year. The factory holds enough whiskey to fill 3 million bottles at any given time, fermented with yeast that descends from the same used in the original batch 140 years ago. See some of the secrets to Jacks unique flavor at the Brown-Forman Cooperage in Louisville, where the barrels for aging are lit on fire to bring flavors out of the wood, and see how burnt sugar maple wood is ground up to make the unique charcoal filter that distinguishes Jack before it is bottled and shipped to more than 130 countries.