This is a Geography for Travelers Podcast related post (click on the title above to download the .mp3 file)
Jewel Cave National Monument is located in the Black Hills of South Dakota, not far from Mount Rushmore. It is currently considered the second largest cave in the world (after Mammoth Cave in Kentucky), but only a small portion of it has actually been mapped, so it may be the largest cave system in the world. (Click Here for more information.)
I did the 1.5 hour tour of Jewel Cave last July and recorded the whole thing. I have edited it down to about 11 minutes, which I hope will wet your appetite to visit the cave in person. My visit was not a true spelunking experience, which they do offer, but which I don't think I could personally do. Multi-day spelunking trips require that you crawl through 7 inch spaces and carry out all of your personal wastes!
Special thanks to the great Ranger guide who took us on our walk through Jewel Cave!
[OOPS! The original file I uploaded was saved at a rate of 24000Hz, instead of my usual 22050Hz. This probably caused problems for most listeners. sorry about that. I have uploaded a new file that is correct.]