Mammoth Cave National Park, Kentucky

by | Destinations, USA | 14 comments

If you have any interest at all in geology or history,  Mammoth Cave National Park is a must. Mammoth Cave is the most extensive cave system in the world. Four hundred and twelve miles of tunnels, caverns and chambers deep below the earth’s surface have been explored – so far! And it is utterly stunning.

In Mammoth Cave, Kentucky

We visited Mammoth Cave National Park on our recent road trip and loved it . This area of Kentucky is famed for its caves and sink holes;  Mammoth Cave, as its name suggests, is the largest. The limestone in the area is responsible for the formation of the caves. When the rainwater passes through the ground and picks up carbon dioxide, it forms a weak carbonic acid which gradually erodes the limestone, forming caves and sink holes. We saw further evidence of this on various hikes in the area.  It also explains why Jack Daniel built his distillery where he did with the adjacent cave and spring (see And now for the WhiskEy Trail).  The quality of the water is crucial for distilling whiskey (and whisky! – see On the Whisky Trail).

Tours of Mammoth Cave

There is a variety of tours to take. We opted for the Domes and Dripstones tour (which also takes in Frozen Niagara). The tour cost $17 each and lasted a couple of hours. We went in October on a weekday and it was busy, some tours full. The advice to book should be taken seriously therefore.

Inside Mammoth Cave, Kentucky

The tour, in short, was excellent. Before we set off, the lead ranger was at pains to stress that this was a physically demanding tour involving a fair bit of walking and climbing of steep steps. She also pointed out that in places the tunnel was very narrow. She was right to point this out. The tour starts by descending 280 steps; this descent has to be made up on the way out, and the ascending flight is very steep, although there are fewer steps. Although the cave opens out into giant chambers in places, the tunnels are very cramped. Anyone with claustrophobia would not be comfortable.

Inside Mammoth Cave

We stopped in the larger chambers several times for people to catch up and for the Ranger to explain the history and geology of the cave. She was clear, informative and entertaining, exactly what you want in a guide. In the first chamber, we got the chance to experience total darkness when she switched off the lights. I find this pretty scary, I must admit, as I have done this on tours in the past. It was reassuring to know that my phone with its light was in my pocket and fully charged!

Inside Mammoth Cave, Kentucky

Different areas of the cave system have different features, largely dependent on how much or how little water is in this particular place. The most extensive formations of stalactites and stalagmites appear towards the end of the tour in the Frozen Niagara area. This is spectacular.

Inside Mammoth Cave

Rock formations in Mammoth Cave

Inside Mammoth Cave National Park in Kentucky

Rock formations in Mammoth Cave

Rock formations in Mammoth Cave

The limestone formations are intricate and beautiful, dripping down in layers from the roof and growing upwards from the floor. It is a weird, wonderful and very beautiful landscape. Parts of it also look like a scene from an Alien movie!

This was an excellent tour and very memorable. As long as you are of reasonable fitness and not claustrophobic, I would definitely recommend it.

Mammoth Cave National Park: basic facts

Mammoth Cave National Park is a couple of hours drive south of Louisville in Kentucky. It was designated a national park in 1926, but not fully established as such until 1941. It is now a World Heritage Site. The park above ground also has much to offer and is definitely worth exploring. It is largely forested and there are some great hikes and cycle paths. One foray out on the bikes saw us crossing the river on the free ferry in order to get up to the mountain bike trails. An added novelty!

Camping at Mammoth Cave National Park

We were travelling in our motorhome and stayed in the park campsite. As usual with national park campsites, it was lovely: quiet, in amongst the trees and in beautiful countryside. There was no hook up, but water and a dump are available on the site. There is no wifi, but we managed to pick it up at the visitor centre.

Mammoth Cave National Park makes for a great visit. We spent three nights there and could definitely have spent longer with so much to explore.


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  1. This looks like a fascinating experience… I think I’d have been scrabbling around for my cellphone flashlight when the lights went out too!

    • I didn’t use it; I was just glad that I could have done!

  2. I have always wanted to visit Mammoth, but I’m reluctant to because it’s so far down/closed off. Not sure how I would deal with it. Your photos are excellent. The limestone has left impressive formations!

    • It is deep, but the tour was well organised and confidence building.

  3. I always love tours that go underground, but for me that’s usually an old mineshaft or something. That fact that these caves have beautiful limestone formations is even cooler!

    • Yes, it is so interesting to get into these hidden nooks and crannies!

  4. It looks stunning! I love to explore caves but on the other hand, am always relieved to get back in open air too. Always a bit creeped out by the idea that I can’t get out. But the rock formations are so beautiful. I always imagine how it would have been in the ice age when people were living there in the cave.

  5. I’ve only explored small caves and would love to visit Mammoth some day. I am a bit claustrophobic, but I have a feeling the beauty of the caves may drive those fears away 🙂

  6. This post brought back so many great memories of my children going here on a field trip in elementary school. I think Mammoth Caves is one of the best in the whole country, and I’ve toured plenty. Thanks for the great photos and information about it.

  7. We love doing cave tours. We did one while we were in the Washington, DC area. Mammoth Cave looks so cool! At $17 a person, it also seems like a pretty affordable tour. We’ll have to keep this in mind the next time we’re in Kentucky.

  8. I’ve heard about this before, I really hope to get to visit this one day. You’re so lucky you got to see it first hand!

  9. Mammoth Cave looks very unique and worth visiting as it has many interesting sinkholes. Also, I would love to see frozen Niagara Falls at the end of the whole tunnel tour. Thanks for sharing all the information about the natural wonder.

  10. Oh we had no idea that Kentucky is famed for its caves and sink holes! We both love visiting caves and grottoes, and have always wanted to visit Kentucky one day! So thanks for this inspiring post! Besides, your photos are really great. It’s very hard to take good pictures in caves and grottoes. And in most caves in Europe it’s not allowed to take photos too.

    • Thank you. Hope you get there as it is a really interesting area. The guide was fine about photos, but keen about no touching the walls etc, which is understandable.


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Hello!  I’m Jane. I live in the Lake District in the north of England with my husband, Peter. We love to travel, but this is a great place to call home.

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