There isn’t anything special here, at least as far as the eye can see. There are no natural boundaries or landmarks. No buildings or structures of note. Even the surrounding scenery is unremarkable. Only a small plaque identifies the significance of this particular point.
As with many silly things in American life, this one started with an act of Congress. Rather than drawing the boundary of the new Arizona Territory along objective geographic lines, they defined it as starting at the corner where the Colorado Territory ended. This prevented subsequent changes in geographic surveys from shifting borders relative to one another and breaking up the only point in the U.S. where four states meet.
Little did they know that nearly 150 years later this small decision would cause thousands of people each year to drive hundreds of miles into the middle of nowhere to do things like this . . .