The caverns were discovered 120 years ago, by Andrew Campbell and Benton Stebbins,

and their soaring walls reflect every color of the rainbow.

Some rooms have monumental columns with celilings more than 10 stories high.

Plus, if you go, you can hear the world's only Stalacpipe Organ.

Stalactites are tuned to concert pitch and accuracy, and are struck by electronically controlled rubber-tipped

plungers to produce music of symphonic quality.