This is the longest cave system in the world with tunnels of more than 400 mi and still counting. National park services offers some interesting tours, some 5 hrs long exploring deeper sides of the cave. However, you need to make reservations ahead of time if you plan to visit during a holiday or weekend. We failed, so we only saw a small portion of the cave on two separate tours. We spent some time exploring the surface.
![Hiking on the surface. Hard to believe the ground below is hollow.](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9575.jpg)
![Signs of spring](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9738.jpg)
1. Historic tour. There are no typical cave formations in this part of the cave. It’s just a large tunnel and they talk about the mining past of the cave.
![The entrance to the Historic tour.](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9554_.jpg)
![Historic tour, Mammoth Cave National Park](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9524.jpg)
![Historic tour, Mammoth Cave National Park](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9532.jpg)
2. Drips and Domes tour. This was a prettier side of the cave with stalactites and stalagmites, but we had share it with another 100 people or so.
![Drips and Domes tour, Mammoth Cave National Park](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9714.jpg)
![Drips and Domes tour, Mammoth Cave National Park](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9659.jpg)
![Drips and Domes tour, Mammoth Cave National Park](http://s-c-photography.com/wp-content/uploads/2015/04/6R8C9708.jpg)
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