Jewel Cave National Monument, Black Hills SD. The Second longest cave in the world, at 159.24 miles. Photo by...National Park Service. We took the kids here on our way back home from Laramie WY. We went on a tour of the cave, they really liked it. This would have been August of 1986.
Hikes 30 Minutes from Denver Looking for Colorado hikes that are easy on your legs and close to Denver? Explore our growing set of hiking trail profiles. Surprisingly, some of the best destination hikes in Colorado are some of the easiest and right out your back door. If you are searching for a great hike for visiting family and friends, check out our page of hike profiles recommended for your out of state guests.