Forbes named Groupon — idea “created by now-CEO Andrew Mason” — as the fastest growing company ever. This website basically “presents an online audience with deep discounts on a product or service.” The company’s headquarters “is located on the sixth floor of 600 W. Chicago Ave., west of Chicago’s downtown, in an old Montgomery Ward building.” Video after the break. Click here for the first picture in the gallery.

[via AcidCowForbes]