National Corvette Museum Building Collapses in Part Due to Sinkhole

Sinkholes continue to be a mysterious problem all over the world, but seldom do they strike in places where they get this kind of attention.  The National Corvette Museum suffered some serious issues after a sinkhole collapsed part of the building.  These sinkholes are happening more and more frequently and in quite a widespread geographic area.  The theories about why this is becoming such a problem are all over the place, from changes in the magnetic field to fracking to HAARP.  What do you think?