Blue Hole Regional Park protects one of the most stunning natural swimming areas in all of Texas, and that’s saying something in a state blessed with numerous beautiful swimming holes. Cypress Creek ...

Ruby Falls is one of those places that stays with you long after you leave. Tucked... The post The Tallest Underground Waterfall You Can Visit in the U.S. Hides Inside a Tennessee Mountain appeared ...

Discover the beauty of the nature cenotes of Mexico. Swim, snorkle and take in the stunning rock formations at the Santa ...

Terrence Tysall set a record scuba diving to the Edmund Fitzgerald. Ric Mixter dove in a submersible, finding a missing body. Here are their stories.

The scariest jack-o'-lanterns of the season are carved deep down in the cold and wet of Lake Chelan, 35 feet below the ...

There are hundreds of caves in Belize that served as portals to what the Maya called Xibalba—home to ancient death gods, rituals, and extraordinary relics left behind. Accessible only by kayak or ...

Between the Sinks and the Rise of the Middle Fork of the Popo Agie, the river famously disappears into subterranean mystery.

Running along the Caribbean shores of the lush Yucatán Peninsula, Riviera Maya is a 100-mile (160km) stretch of sands ...

To someday allow scientists to stay underwater conducting research for days on end, the UK-based company DEEP has designed ...

If you want to escape the crowds of Orlando and Miami, there are plenty of Florida college towns that offer history, culture, ...

That’s the sensation waiting for you at Black Chasm Cavern in Volcano, California – a subterranean marvel that transforms an ordinary day trip into an expedition worthy of National Geographic. Tucked ...

Gregg Township covers 47 square miles and is home to 2,121 residents. Penn’s Cave offers the nation’s only all-water cavern tour and wildlife drives. Spring Mills anchors local life with eateries, ...