The surface of Mammoth Cave National Park encompasses ... or a walk on the River Styx Spring Trail. The least arduous cave tour (0.25 mile, 75 minutes) is the Frozen Niagara Tour.

Today, the Frozen Niagara serves as the grand finale for several of the tours that ... each April. Mammoth Cave could even be one more location to include on your list of the best national parks ...

This is one of the Best Caves in U.S. It offers many cave tours and visitors can get a taste of the cave with a 30-minute self-guided tour. Mammoth Cave offers tours, including an off-trail tour.

They explored the extensive Mammoth Cave system, which had only been partially discovered at the time. Rick Toomey is a geologist and tour guide for the cave system. He tells visitors how Floyd ...