At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

This once luxurious Catskills resort is now a haunting ruin.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

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

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

The summit Roosevelt conquered before he descended to become The Chief.

Six peaceful acres in a residential neighborhood dedicated to art and peace.

Spike Lee's provocative film is officially honored right where it was made, the first time a work of art was used as a secondary street name.

Three stories above you, your salad is being grown.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

This 19th century brick building in Brooklyn stands out like the anachronistic landmark that it is.

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

A large camera obscura, constructed entirely from digitally fabricated components.

The Underground Railroad passed right through this historic Brooklyn Heights church.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."

An unconventional space for art and science housed in a massive old warehouse.

Red frames showcase remnants of one of New York's original subway stations.