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

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

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

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

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

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Legends surround this jagged rock formation in the New Mexico desert.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

On the Hudson resides one of the largest clocks in the world.

Take a step into the workshop where Edison and his employees revolutionized the world.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

A beautiful Gilded Age hotel in the White Mountains with surprising diplomatic history.

The summer home and later final residence of acclaimed American sculptor Augustus Saint-Gaudens.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

The museum is housed inside the historic 1863 Carson City Mint.

The oldest standing building in Las Vegas was established by Mormon settlers.

This Las Vegas casino boasts one of only three spiral escalators in the United States—an engineering wonder.