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Under the forested hills of south-central Kentucky runs the world's longest known network of caves, and surveyors are still adding new passages to the map. Mammoth Cave became a national park in 1941 and a World Heritage Site in 1981, and its history runs from prehistoric explorers to saltpeter miners and the enslaved guides who charted many of its passages in the 1800s.
Underground, ranger-led tours are the way in. The Historic Tour enters through the Historic Entrance and passes huge dry corridors and tight squeezes, while the Frozen Niagara and Domes and Dripstones tours show off the dripping formations found in wetter sections. Longer outings such as Grand Avenue and seasonal special tours suit those who want hours below ground. Above, trails lead past Cedar Sink, a large collapsed sinkhole, and along bluffs where River Styx Spring and Echo River Spring emerge into the Green River. Canoeing and kayaking the Green, or a short walk to the rock shelter at Sand Cave, round out a visit.
The park appeals to families, geology fans and anyone escaping summer heat, since the cave stays cool all year. Tours sell out in summer and on holidays, so reserve ahead. Nearby Cave City and Horse Cave, home to Hidden River Cave, provide lodging and roadside attractions.
WiserMap travel guideMammoth Cave Kentucky Cave Tours and Frozen NiagaraPlan Mammoth Cave National Park: which cave tours to book, Frozen Niagara, the Historic Entrance, Green River trails, gateway towns, seasons and practical tips.Read the guide
The natural opening of the world's longest known cave system, with more than 420 miles mapped, reached by a short paved trail from the visitor center. Cool air pours out even in summer, as the cave stays near 54 degrees year round. Many tours start here, but you can also walk down to look in at the entrance for free.
One of the most famous formations in Mammoth Cave, a huge flowstone that looks like a frozen waterfall, with stalactites and stalagmites in the Drapery Room below it. The short Frozen Niagara tour, about 1.25 hours, is a good choice for families who want formations with few stairs. It starts with a bus ride from the visitor center.
A two-hour guided tour of about two miles through huge passages near the Historic Entrance, past saltpeter mining works from the War of 1812, old signatures and Native American artifacts. It includes tight squeezes like Fat Man's Misery and climbs at Mammoth Dome. Reserve tickets online in advance, as tours sell out in summer.
A guided tour that reaches a newer entrance by bus, then descends about 280 steps through tall vertical shafts and domes before reaching an area of colorful dripstone formations, ending at Frozen Niagara. It lasts about two hours. It includes many stairs and is not suitable for people with mobility or heart problems.
The park's longest regular cave tour, about four miles over four and a half hours, through dry upper passages to a lunch stop at the underground Snowball Room, then past gypsum formations and on to Frozen Niagara. It is strenuous, with steep hills. It runs mainly in summer, so check the schedule and book well ahead.
The main hub of the park, where cave tours are booked and most begin, with a museum on the cave's geology, history and wildlife, ranger help and a bookstore. The Lodge at Mammoth Cave and a cafe are next door. Pick up tickets early in the day, and bring a light jacket for the cave, which stays cool all year.
A large sinkhole south of the Green River where a stream appears from the ground, flows across the bottom and disappears again underground. A trail of about one mile with stairs and boardwalks leads down into the sink. It is a quiet hike that shows how the karst landscape above Mammoth Cave works. Look for wildflowers in spring.
A nine-mile trail between Park City and the visitor center that follows the route of the old Mammoth Cave Railroad, which brought visitors to the cave from 1886 to 1931. It is open to bikes and walkers, with gentle grades through woods. Look for the old train engine Hercules displayed near the visitor center.
A spring where an underground river from Mammoth Cave flows out into the Green River, reached by the River Styx Spring Trail from the visitor center. The loop links with the Green River Bluffs trail, with views over the valley, and passes Echo River Spring. It is a pleasant walk of two to three miles through hardwood forest.
The river that carved Mammoth Cave flows through the park and is one of the most biologically diverse rivers in the country, with many kinds of fish and mussels. Canoe and kayak trips can be arranged with outfitters near the park, and the small Green River Ferry carries cars across. Check river levels before paddling.
A small cave reached by a short boardwalk trail, where cave explorer Floyd Collins was trapped in 1925 while trying to find a new entrance. Rescue attempts became a national media sensation, but he died before rescuers reached him. Today you can only view the entrance from the trail, which takes about 15 minutes.
In the town of Horse Cave, about 10 miles east of the park, Hidden River Cave has a large entrance in the middle of town and the American Cave Museum, which tells how the cave was polluted and later cleaned up. Tours include an underground river. Nearby Cave City has motels, restaurants and roadside attractions.
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