The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Despite not growing anywhere near New York City, bananas are ripened in a pressurized room in the Bronx using precise banana science.

The "Seinfeld" diner.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

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

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

The longest step street in the city.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

Walking around West Harlem reveals a scavenger hunt of beautiful bird murals.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

The highest point on the island known for buildings that touch the sky.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

The world's oldest soul food restaurant is also one of its best.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

The oldest continuously operating fish market in the United States.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Fittingly, America's museum of architecture is itself a magnificently designed old building.