Pennsylvania has plenty of famous caves, from the underground river of Penn’s Cave, to Lost River Caverns, Crystal Cave, and more. The most unique cavern in the state, though, is one-of-a-kind across the globe: Coral Caverns in Manns Choice, which is the only known cave in the world that contains a fossilized coral reef.

heather_inthemtns/ Instagram When you approach Coral Caverns, you will be greeted by a somewhat nondescript sign. Be prepared for the amazing sights that wait for you within…

James St. John/ Flickr The coral reef remains within Coral Caverns were formed over 400 million years ago, when Pennsylvania was covered by “the Great Inland Sea.” Though Pennsylvania’s landscape as it exists today betrays no evidence of its watery past, once you enter the cavern, it will become immensely clear that at one time, aquatic life prospered here.

James St. John/ Flickr What an incredible reminder of the ever-changing geology of our planet. The fossil wall within Coral Cavern is a truly unique sight - enjoy looking for the preserved remains of various sea creatures.

James St. John/ Flickr The owner of Coral Caverns is known for being very inviting and knowledgeable about the cave. It is one of the best-kept secrets in Pennsylvania - one that you should not miss.

Coral Caverns/ Facebook Find Coral Caverns close to exit 146 on the PA Turnpike, open from 10 am to 3 pm daily.

Have you ever been here? Or do you plan to go? Tag someone you’ll bring with you in the comment section! Thanks for reading.

heather_inthemtns/ Instagram

When you approach Coral Caverns, you will be greeted by a somewhat nondescript sign. Be prepared for the amazing sights that wait for you within…

James St. John/ Flickr

The coral reef remains within Coral Caverns were formed over 400 million years ago, when Pennsylvania was covered by “the Great Inland Sea.” Though Pennsylvania’s landscape as it exists today betrays no evidence of its watery past, once you enter the cavern, it will become immensely clear that at one time, aquatic life prospered here.

What an incredible reminder of the ever-changing geology of our planet. The fossil wall within Coral Cavern is a truly unique sight - enjoy looking for the preserved remains of various sea creatures.

The owner of Coral Caverns is known for being very inviting and knowledgeable about the cave. It is one of the best-kept secrets in Pennsylvania - one that you should not miss.

Coral Caverns/ Facebook

Find Coral Caverns close to exit 146 on the PA Turnpike, open from 10 am to 3 pm daily.

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