We've compiled the best of Anthony Bourdain's US trips in The US Files - Volume 4, in which he further explores Montana, Illinois and Maine. Tony heads to Montana to visit a family of fourth-generation ranchers who not only run a cattle operation, but also a dude ranch. Then Tony heads to Livingston, MT, to try his luck at fly-fishing. Outfitted with the latest (and most flattering) gear, Tony is ready for his foray into fly fishing with local Dan Lahren, determined to make an on-camera catch. He meets with Russell Chatham, a renowned landscape painter, who has made Montana his home. Then Tony visits Chicago, IL, to meet with resident Peter Engler who, aside from studying mouse genetics for a living, also makes a hobby as a foodie, seeking out strange and delicious foods in little known places. They visit Fat Johnnies for a taste of the heart attack-inducing "Mighty Dog", a tamale and meaty chili on a bun. After that, Tony visits Hot Doug's, home to hot dog perfection. Not only does Hot Doug's serve the best hot dogs, they also serve French fries fried in pure duck fat, and of course... the foie gras dog. At the opposite end of the spectrum, avant-garde chef Homaro Cantu has been torching, deconstructing, and reinventing food for years at his restaurant Moto. He introduces Tony to some of his creations such as Road Kill, Cuban Cigars, and edible menus. Finally, Tony travels to Maine with his longtime cameraman and native Mainer, Zach Zamboni. Zach exposes Tony to the food and people of the "two Maines"- the civilized coastal area and the sparsely populated, untamed, interior region, which includes Zach's hometown of Milo.