- We have a tour coming through.
This cave is actually a working cave, a working show cave,
and there's a tour group coming on, yeah.
Hey now, you're safe, I promise.
You can walk through there if you like,
just be careful of the mic.
If you look up that way you can see one
of the pieces moving, you'll see it.
(gentle piano music)
The sound that you're hearing is coming
from the stalactite pipe organ.
It's actually the largest musical instrument in the world
and it's covering over three and a half acres.
There's over five miles just of wires
running to make this thing work.
It took them a full three years to build
and they started back in 1954.
There are little small electronic mallets that strike
the stalactites, and they had to find the right ones to make
the right sound, and that's why it's spread out so far.
They had to find the right one to hit it,
make a little vibration, and then little microphones
pick that up and it's tuned actually to the concert pitch.
(gentle piano music)
- [Woman] Alright, if you guys could follow me.
- [Man] Thanks, Allison, for bringing your group through.