This is a Rail to Trail that is a gravel out and back from Mammoth Cave National Park to Park City. It is not very challenging like you would normally think of Mountain Biking. It is historic and you go past places that were there at the beginning of the last century and it is nice to see some of those historical things. I was camping at the national park and decided to ride it and see what was there. I saw wild life and the evidence of other people from another time. That was nice.