This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

The easternmost town in Alaska can only be accessed from Canada.

A stranded woman lived alone on this remote island for 18 years, inspiring the great children's novel "Island of the Blue Dolphins."

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The overgrown remains of one of the premier auto-racing speedways in the Midwest—and also one of the most deadly.

A railroad lift bridge that was only lifted once and became obsolete before construction was finished.

The ship that got left behind.

The largest hewn stone in history.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

An unusual geological feature towers over the remains of a dark episode in United States history.

Don't blink or you'll miss it.

A tribute to the statues of Easter Island along Route 66.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

A memorial to the firefighters who died in an industrial disaster is housed in a small public park.

A memorial to a larger-than-life legend, inside a county that also holds Bunyan's death certificate.

Fifty years after a “blast blasted blubber beyond all believable bounds,” this idyllic natural area commemorates the carnage.

One of the world's earliest skyscrapers.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

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

Man-made geyser that rises to the exact height of the Gateway Arch.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

One of California's oldest continually used high schools has an interesting history, both on and off screen.