#3 -- Coors Brewery, Golden, Colo.
: Founded in 1873, Coors' Golden operation is today the largest single-site brewery in the world. Visitors can enjoy a complimentary, 30-minute self-guided tour of some of the site's highlights, accompanied by an audio device which details the malting, brewing and packaging processes. Once the walking is done, thirsty travelers can cool off in the "fresh beer room," and sip a cold sample while resting on ice-cube benches in a refrigerated room. (Courtesy TripAdvisor)