And this one is serious - the Four Corners marker is in the wrong place!
According to readings by the National Geodetic Survey, the Four Corners marker showing the intersection of Arizona, Colorado, New Mexico and Utah is about 2.5 miles west of where it should be.
Update from ABC:
Four Corners marker off by only 1,807 feet
Doyle said some confusion over how far off the monument is from the "true" Four Corners has stemmed from how it's measured.
The measurement should be taken as 32 degrees longitude west of the Washington Meridian, which passes through the old Naval Observatory in the Foggy Bottom neighborhood of Washington, D.C. That calculation yields the 1,800 foot disparity.
Measuring instead to the 109th meridian west of Greenwich would suggest a much larger difference of about 2.5 miles.
Besides, the measurement differences don't matter anymore, Doyle said, because "the monument controls."
"Where the marker is now is accepted," Doyle said. "Even if it's 10 miles off, once it's adopted by the states, which it has been, the numerical errors are irrelevant. It becomes the legal definition" of the Four Corners.
Thanks to the Maps-L listserv