"Mustang" by Luis Jiménez. His final work, Jiménez was killed when a large section of this piece came loose and pinned him against a steel support at his New Mexico studio.

Photograph provided courtesy of Denver International Airport.

Airplanes aren't all that's flying around Denver International Airport. So are conspiracy theories. They've been around since DIA opened. Former Minnesota Governor Jesse Ventura highlighted them in 2010 on a TV show called "Conspiracy Theory."

One theory says elites will have a refuge at DIA during some apocalyptic event. Another claims lizard people live in the miles of tunnels below the airport.  DIA "embraces the unbelievable" this month with a series of events including tours and exhibits highlighting those theories.

Airport spokesman Heath Montgomery spoke to Colorado Matters host Ryan Warner.