The deepest free-fall pit in the lower 48 United States, the Fantastic Pit features a staggering 586 feet (179m) drop - a ...

The Makauwahi Cave Reserve, located on an undeveloped swath of coastline on Kauai’s south shore, is the largest limestone cave in Hawaii. The cave’s ceiling collapsed about 7,000 years ago ...

Cascade Caverns is a 125-million-year-old cave. It’s 65 feet deep and about a mile long, with a constant temperature of 60-63 ...

Below a rolling green carpet of rainforest, its limestone is riddled with some of the planet’s most extensive cave systems. “Of course, when I got started, we didn’t have kit like this ...

Cave pearls are formed when a drop of water from the ceiling hits the limestone floor and throws up a speck of rock. This grain is jostled in its little cup of stone every time a drop hits it.

VISITING six caves in a single day might sound daunting, but with the right preparation, you’ll encounter quartz crystal mounds, creatures adapted to life without light, 100,000-year-old pillars ...

ISLA: To Traligill Caves! They’re in the North West Highlands GeoPark and they’re made of limestone. There are three cave entrances in the limestone in this area. But we have to be really ...

UENO, Gunma Prefecture--The Fujido limestone cave, which burrows for around 2.2 kilometers and is one of the largest in the Kanto region, has reopened featuring alternating LED lighting.