This architectural triumph is the only Frank Lloyd Wright house in Alabama.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Cherokee alphabet, proof of ancient North American Jews, or just a hoax?

Step back in time on this preserved 1800s farm.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

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

The symbol was surreptitiously built into the river bank by German prisoners of war.

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

A blacklight journey through a celestial art exhibit.

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

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The world's longest known cave system.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

The site of one of history's most indelible and horrific tragedies.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.