As the saying goes, nothing is certain in life but death and taxes. But how well do you really know the agency that collects your federal taxes the IRS? Most of us only hear from the IRS twice a year - when we get our tax forms and when we get our refund. But what about sides of the IRS you've never seen? Experience the challenge of collecting trillions in taxes from hundreds of millions of taxpayers as NGC takes a look inside IRS processing facilities.