I never expected to see an organ in a cavern.
The Great Stalacpipe Organ is the largest instrument in the world.
It is a lithophone made from solenoid fired strikers that tap stalactites of various sizes to produce tones similar to those of xylophones, tuning forks or bells.
There was a plaque near the organ that said,
Manís genius and the hand of God are in perfect harmony.