Reminded me of my trip to Israel to the "Stalactite Cave Nature Reserve." If anyone is into this stuff definitely read about it. "Zillions" of years in the making of this Lord of the Rings Mordor looking phenomenon.
Probably one of the coolest non-religious/historical sites to behold when I was there with the lighting effect to show it off. And it's still occurring, watching the water slowly drip, drip, drip.
But it was sooooooo humid in there like in the Tassie Tunnel. When I came out my glasses were fogged up and my mother's hair turned into a giant Afro!