Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

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

This is one really big nut.

Inside this small museum resides a strange mix of miniature collections passed down over time.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Welcome to a starkly beautiful sanctuary where the buffalo roam.

This Texas windmill field celebrates the power and majesty of the very winds that blow.

The tree is thought to be the oldest oak in Texas and was once crowned state champion for its monumental size.

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

One of the largest publicly funded mural in the country is one city's love letter to itself.

One of the largest collections of intact Victorian-era waterworks equipment in the world.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

A 200-year-old bar is all that remains of one Mississippi River town's rough-and-tumble past.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

An abandoned coal mine reached by a steep hike.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This candy-striped tower is the farthest east you can go in the United States.

This huge 12-foot concrete moose on the coast of Nova Scotia is the grandest of the sculptor's giant creatures.

How would you like to dine in the same room where some of the Titanic's victims were embalmed?