Ever wondered what happens behind the closed doors of your favorite brands? Our friend Linc Eather at the product blog, Empire Ave, has got a series of articles coming out called ‘Behind Empire Lines’. He took a trip to the U.S. and invited himself along to all the cool HQ’s there. The second installment is Oakley’s amazing offices which includes a tank, army bunker (with live cannon) and a bike track … Not to mention the coolest waiting room seats in the world. Head over here to check it out.