This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

This turn of the century jail once held Charles Manson.

The bespectacled, cocktail-sipping pachyderm is a strange but fitting liquor store mascot.

The summer home of the largest colony of bats in the world.

A somber monument commemorates the site of a Native American reservation marked by suffering.

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

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

The U.S. Air Force has an anti-satellite laser weapon.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

Mysterious glowing orbs float through the desert night.

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

A museum dedicated to the alleged Roswell Incident.

Search for traces of the dinosaurs that roamed here more than 90 million years ago.

A cave's rare beauty held a cavernous secret hidden underground.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

This is one really big nut.

More than 21,000 images fill this overlooked gem of a prehistoric site.

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

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.