In Great Basin National Park—one of the few national parks without an entrance fee — there is a cave. You have to pay for the cave tour (either 60 or 90 minutes), which caps at around 20 people and takes you into the depths and history of what should be a truly spectacular natural creation. Lehman Cave — one of only 70 caves in the United State with formations called shields — has nine tours each day.
That’s a lot of feet that trek through the cave. Though the rule now is not to touch anything, Lehman Cave’s history consists of breaking formations for souvenirs and burning initals onto the cave ceiling as a form of graffiti. In the past, dances have been held here and Boy Scout troops have camped. The lights that mark the way throughout the cave are so warm that algae is growing near them (the good news is that they are starting to replace standard bulbs with LED lights). Once a year, the park gathers volunteers to pick lint and skin cells, which cling to the cave walls as they naturally pass through the air.
Sounds like a “natural” kind of place, huh?
I’d been under the impression that I would find 
