Would You Open This Door?

See for yourself.

It's a world void of color. Dull, beige pillars surround the dull, beige floor. Dull-faced people in dark-colored clothing shuffle from point A to point B.

Perhaps this is a typical day at Chicago Union Station, but the appearance of a mysterious door is about to change that.

A cryptic sign stands next to it and reads, "What Is Behind the Door?"    

Let's just say, Chicago Union Station just got a lot more colorful.  

(H/T: Blake Grigsby