How to explore a Cavern
It made me
Happy 
"Very cool"
How I did it: On a trip to TN to check out some schools, we stopped in Bristol, TN to go into a cavern. There was a river in there where the fish had no eyes (they obviously evolved this way because they don't need eyes when there is no light). The stories and information we were presented with was incredibly interesting. I'd like to check out more...
Resources: http://www.bristolcaverns.com/
