Spotted this passage in the text version of a recent university lecture on project management that goes pretty deep into the construction of DIA:
Denver international airport had a poor public relations image from the beginning, but it did not help when it came to the attention of the then Mayor Webb that the new airport was being built on an ancient Indian burial and warring site and this led to several rituals being performed by the Indian witch doctors in an effort to appease the dead spirits. The Mayor at a later stage also commissioned murals to be painted for the new airport. The murals that were painted were considered offense because they depicted an African woman, a Red Indian woman and a Caucasian lady lying in open caskets. This led to a lot of speculation that the murals had masonic interpretations.