This was a neat little thing to stop and see on our road trip. The cost was less than $7 which I thought was appropriate. They have a neat little show where they dim the lights, and the stars on the ceiling shine and there's a voice over and music. It's located near some Amish communities, so when we visited, there was a large Amish family visiting as well. It was a great cultural experience. There is also a nice gift shop.
If you're going by Natural Bridge, VA then this is a must-see. My friends and I had a lot of fun stopping here on our road trip. It's a great, free thing to break up a drive. When we went, it was a beautiful day and no one else was there. We took a lot of pictures and goofed around. Be warned: you have to climb up a grass hill (or drive around and up a very, very bumpy "road") to get to it. While we were there, there was an insane amount of bugs- it was hard to even open our mouths because they'd fly in! But it was a great experience. A perfect road trip stop!