Why have you never heard of the second most popular tourist site in New York?

Here, exhibits come with a side of edible history.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

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

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

The notorious headquarters of a corrupt political machine.

When ecosystems collide in the arid Southwest.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A modern zoetrope on the New York City subway.

The highest bridge in America was built for an almost unnervingly small amount of money.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Rummage through this sunken ship, but leave your scuba gear at home.

The first museum in the United States dedicated entirely to posters.

Commemorating the spot where the famous scientist fed his pigeons.

The eccentric mansion of one of the most popular horror authors of modern times.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.