Denver International Airport is unique.

From the architecture to the natural lighting, and from the head-scratching sculptures to the scores of strange murals, DIA is a Midwest hub home to thousands of travelers, massive infrastructure, and yes, even conspiracy theories.

DIA is also the fifth-busiest airport in the United States and hosted roughly 52.5 million passengers in 2013 alone (approximately 143,000 per day), according to the company site. What many of the passengers may not realize is the prominence of natural gas in the Mountain Tim...

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