Thanks to its location alongside the Blue Ridge Mountains, Shenandoah
Valley sits on a limestone base – the geological equivalent of resting
on Swiss cheese. Limestone is the softest type of rock formation in
nature, and dissolves in contact with rainwater – about 1/10th of an
inch every year. Thus the valley boasts an impressive collection of
caves that go for 150 miles. There are seven commercial caves, ranging
from quirky mom-n-pop ventures to US National Landmarks. Go there...