We descended into Hellhole Cave, one of the deepest and most dangerous caves in the United States. With sheer vertical drops, ...

The cave gets wet and has the potential to flood during heavy rain, with a ceiling height in the cavern ranging from 35 ft.

Caves remain unmapped in our know-everything age. They inspire artists, hold ancient secrets and, in the popular imagination, they're the refuge of bandits and terrorists.

Carter Caves State Park Resort, located in northeast Kentucky, offers more than 30 miles of trails and has a cave system of more than 20 caverns, according to the state park's website.

Cave pearl formation is a slow process that can take thousands of years, and depending on how long it’s been, they can be tiny specks, or – as in the case of Hang Son Doong – giant pearls ...

Caves are absolutely pitch black, not like a dark night in the forest. There is no light at all. So you can wave your hand in front of your face and see literally nothing.

The cave opened in 1932, making it the longest-run show cave in Iowa. Advertisement Crystal Lake Cave is open on Saturdays and Sundays from 9 a.m. to 5 p.m. and by reservation other days of the week.

Spook Cave is open from May to October with reservations available on weekdays. The website has a calendar that includes first-come, first-served dates. It costs $16 for adults 13 years and older ...

The caves there make for especially good lunar lava tube analogues, according to Rossi, because its volcanoes are very young, and its caves don’t have much in the way of soil or vegetation. The ...

Carter Caves State Park Resort, located in northeast Kentucky, offers more than 30 miles of trails and has a cave system of more than 20 caverns, according to the state park's website.