Isn't that just so fascinating to know that you're looking at something so incredibly old?! I was driving through Texas with my boyfriend at the time (a very long time ago) and I saw a sign on the side of the road about a cave. It was 10 miles out of our way (we were headed for New Mexico) and I just spontaneously turned us in that direction. Turned out it was a 'private cave' and so raw and rough that we had to use ropes to get down into it and flashlights to see ;) Bats were flying out, too! And OMG, it was 'ALIVE'! I had only seen pictures of caves in the past that were brown and stone colored. I had no idea that these were dead caves. The colors and the patterns in this living cave were so amazing - and yes, so incredibly delicate.