Denver International Airport is the largest international airport in the United States, and the second largest international airport in the world. However, its most notable features are concealed beneath ground level, including an inaccessible 88.5 square mile base buried 150 feet underground, and five large underground "storage buildings" which are mysteriously undergoing intermittent construction, are strikingly resemblant of Nazi underground detention camps, and are inexplicably interconnected via a complex tunnel system. The tunnel system is equipped with an ominous sprinkler system which seemingly was deliberately installed for an yet undisclosed purpose. Intriguingly, European geopolitical leaders, including Queen Elizabeth II, have individually purchased property nearby under different aliases.