The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A local prank turned town icon.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Community bookshelf of 25-foot-tall book spines.

This giant green head remembers one of America's jazz giants.

This abandoned prison castle has become an imposing gallery of graffiti art.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

European castle ruins in an American state park are actually the product of death and grief.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A peaceful place in the woods where everything is a work in progress.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

This historic bridge has weathered fires and floods and still stands, now abandoned, where it has stood since 1874.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

Home to the story of the outlaw turned funhouse mummy, Elmer McCurdy.

Built from oil field parts and resembling a teepee, this abandoned mid-century church is hoping for a comeback.

Only museum dedicated to women pilots, with personal artifacts from Amelia Earhart and other aviatrixes.

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

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

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

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

Adobe ruins punctuate the beauty of an 800 foot canyon carved by the Canadian River.