The Blowing Rock, North Carolina's oldest travel attraction since 1933, is an immense cliff 4,000 feet above sea level overhanging Johns River Gorge 3,000 feet below.  At the time the rocks of the Blue Ridge Mountains were being thrust up by tremendous forces that slowly squeezed the rocks of the region very much like a huge vise, other natural processes of weathering and erosion started tearing down the young mountains. Now, after more than 250 million years have passed, mountain building has ended and erosion has gradually stripped off the uppermost miles of rocks that were originally here. In the process, rocks that were once buried and squeezed under the weight of miles of rock are now exposed at the top of the Blue Ridge Mountains where we see them at The Blowing Rock and other areas in this region.