Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The cave where two British judges hid in exile after sentencing the king to death.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

An Irish Memorial commemorating those who perished due to potato blight.

Yo, Adrian!

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

An unassuming stone building houses New York City's oldest seismic station almost 30 feet below the Bronx.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

A small graveyard is hidden in the midst of a bustling university campus.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Commemorating the spot where the famous scientist fed his pigeons.

The most confusing clock in New York.

A modern zoetrope on the New York City subway.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

The highest rapid transit station in the world.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

A humble air museum located in an original World War II aircraft factory.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This slender three-story building has also had several famous residents.

Phil Mortillaro uses keys to bring art back to the Village.

The first piece of public art dedicated to LGBT rights.