The largest self-built castle in the U.S., six decades in the making.

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

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

This popular pilgrimage site offers a hole filled with holy healing dirt.

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

This is one really big nut.

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

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

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

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

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.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

Curious cave that stays a cool 56 degrees all year long.

This is not your typical jungle gym.

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

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Mile-long cave system near Great Smoky Mountains.

3/4-scale model of the White House in Atlanta, Georgia.