This is one really big nut.

A clear blue swimming hole with hidden caves, still unexplored.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Three hundred years of preserved Spanish colonial history in San Antonio.

The oldest continuously occupied public building in the United States.

A natural formation that resembles a camel resting in the New Mexico desert.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Supposedly Satanic numbers adorn this preserved submarine sail.

A hotel with a rich Wild West history of miners and bootleggers.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.