A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

A recently restored substation that dates from 1875.

These aggressively sustainable art homes look like something out of 1970's science fiction.

How a bat poo mine became a major Native American archaeological site—and connections to legendary red-haired giants.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

Limestone caves with spectacular showcase chambers.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

See massive fossils that are over 200 million years old in northeastern Arizona.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Hike the ruins of a zoo that was shut down by an unsolved murder.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

Five restored historic road bridges in a park along the Kalamazoo River.

Play over 120 retro arcade games and pinball machines at this throwback museum.

Fascinating military history, awe-inspiring wildlife encounters, and endless outdoor adventures draw people to this sprawling park.