This post may contain affiliate links or mention our own products, please check out our disclosure policy.

Discover The 10 Most Amazing Caves In The United States – An Adventure Down Under

This post was updated on March 15th, 2024

4. Mammoth Cave National Park – Kentucky

Most Amazing Caves
NPS.gov

The name says it all. With 400 miles of explored passage ways, Mammoth Cave is the longest cave system in the world.

Renowned for its size and vast network of extremely large horizontal passages and vertical shafts, a trip through the cave reveals impressive stalagmites and stalactites, beautiful gypsum flowers, delicate gypsum needles, and over 130 species of flora and fauna.

Explore the cave with a short self-guided (free), or book a longer guided tour. Choose from a variety of tours including the six-hour Wild Cave Tour ($55 ages 16 and up) which takes you on through five miles of less developed parts of the cave system.

Sign up for the newsletter today!

Please enter a valid email address.

An error occurred. Please try again later.

× logo

Thank you for subscribing to the Do It Yourself RV newsletter, keep your eye on your inbox for updates.

For a shorter, less challenging experience try out the 1.5 hour Frozen Niagara Tour ($13 adults, $9 youth), or the two hour Domes & Dripstones​ ​Tour​ ​($15​ ​adults, $​​10​ youth), which both offer views of dramatic formations and relevant commentary.

Be sure to book your tour in advance as this cave is very popular and tours sell out daily.