One of the few remaining railroad turntables is hidden near downtown Raleigh.

A giant concrete churn carries the legacy of American resilience, unity, and greed.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

An abandoned munitions storage facility with a rich architectural history.

This twisty sign depicts the chain's first logo.

This kitschy tavern is also home to rare early editions of "Treasure Island."

A statue honoring 44 continuous years of greeting passing ships.

"X" marks the spot of an echo chamber in the middle of a plaza.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

An early-19th-century hotel with a past that is steeped in the Civil War.

One of the last remaining pedestrian suspension bridges in North Carolina.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A curious art piece along a lovely biking trail marks several historic floods via a series of colorful poles that represent floodwater heights.

A very classy 1920s-era bar right in Grand Central Station.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This geothermal hot spring hides beneath a slowly growing mineral dome.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

There must be a pun in this haystack somewhere...

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

This haunting monument honors the victims of 9/11.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.