A toxic ghost town sitting atop a massive coal fire.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

World's first "penitentiary," meant to be humane, drove men insane.

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

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

On the Hudson resides one of the largest clocks in the world.

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

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This historic train station has been converted to a locomotive themed hotel.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Once America's longest-manned military fort, now an abandoned hulk.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.