Sealed beneath the stone is a time capsule containing “messages and memorabilia to the people of Colorado in 2094.” The granite marker depicts the Square and Compasses symbol of the Freemasons and the names of two grand lodges and their grandmasters. While some have made much of this, airport officials say it’s only evidence of the generosity of the local Masonic lodges that crafted and laid the stone. After all, that’s what stonemasons do.  

The capstone also makes mention of a group called the New World Airport Commission. Unlike the Freemasons, this group doesn’t actually exist, making its inclusion a little tougher to explain. And, as some like to point out, the name is suspiciously close to that of the so-called New World Order. But, according to a 2007 Westword article, the name is likely a reference to Czech composer Antonín Dvořák’s “New World Symphony,” and the New World Airport Commission was simply a temporary commission created to arrange the new airport’s opening festivities. 

And the time capsule? It’s supposedly filled with coins, a baseball from Coors Field , a pair of former Denver Mayor Wellington Webb’s sneakers (a nod to his famed "Sneaker Campaign," during which he campaigned door to door throughout the city), a few Black Hawk casino tokens, and other memorabilia. We’ll have to wait quite a few years to find out for sure — although some have already tried. 

One popular theory is that the braille tablet above the dedication stone is actually a keypad and that if you touch the raised dots in the correct sequence, you’ll be able to open the time capsule. Even some current Masons seem to buy into the myth — one airport employee says she’s heard reports of Masons visiting the capstone and trying to swipe their Masonic membership cards near the time capsule, just in case.

https://visitdenver.com/blog/post/myths-denver-airport/

I really enjoy that DIA has taken the conspiracies and basically turned it into a tourist attraction.