In a tiny Kentucky town, Maker’s Mark produces one of America’s most famous bourbon whiskeys. Known worldwide for its bottles’ iconic red wax, the company sells over 3 million cases of bourbon each year. But bourbon making is a complicated process that depends on special wooden barrels to age the whiskey for years, and the oak trees needed to make those barrels aren’t growing enough to support the next generation of bourbon makers. We visited Maker’s Mark’s one and only distillery to learn more