Most people think of visiting big cities, national parks, and beaches when they plan a U.S. trip. There’s hardly anyone who’s ...

Discovered in 1878, Luray Caverns has been drawing visitors for over a century—and it's easy to see why. Located just west of ...

The Lost Sea is a unique destination that combines natural beauty with a sense of mystery and adventure. Jewel Cave National Monument (South Dakota) Jewel Cave National Monument in South Dakota is a ...

But Jewel Cave, which was designated a national monument in 1908, has more than 180 miles of mapped and surveyed passageways, making it the third-longest cave system in the world. The cave ...

Sweetwater, Tenn.? When a 13-year-old boy discovered what is now the world’s second-largest underground lake, he had to crawl through a muddy hole deep inside a cave and throw balls of dirt into ...

This cave’s name is no exaggeration. Jewel Cave glitters with crystals that coat the walls like frost. It’s the third-longest cave system in the world, with over 200 miles explored.