Every August, the population of South Dakota almost doubles, as legions of rubber-burning and sometimes hell-raising bikers descend upon the tiny town of Sturgis.
It's always a bit of a madhouse, but this year's festival, which begins next week, is the 75th anniversary, and some expect record-breaking crowds.
Our Wheel Thing emcee, motor critic Susan Carpenter, is a veteran. She's been to Sturgis twice, and she explains the what and the why, along with the how - how do you get as many as a million people to a remote town in South Dakota?