One of my favorite field trips was when my high school biology class went spelunking in Illinois caverns. It was a small cave, and there were a few tight squeezes, but overall I really wasn't scared (unusual for me). I loved seeing the stalactites and stalagmites and wading through the underground streams. I remember one area where the water was rushing and we slid down the rocks like a water slide! It was a fun little adventure.
Now I'll just have to explore through pictures.....
Photography by Carsten Peter
More cave photos here